Questions tagged [power]

The electricity drained by a device

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1answer
17 views

Macbook Pro 2018 battery not charging

I am having a version of the battery not charging issue on my Macbook Pro 2018 (13-inch, Four Thunderbolt 3 Ports). The symptoms are somewhat different from related issues, such as in this post. I am ...
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27 views

New Macbook suddenly shut down when using Virtual Box

My MacBook Pro 2019 suddenly powered off when I was booting ubuntu on virtual box. The only other program running on my laptop was the App Store. How can I find out the reason of power failure? It's ...
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1answer
42 views

Why does my 2017 iMac work in every building except my office building?

I moved my iMac from home into my office and it would not turn on at all there. So I took it around the corner to a repair man and it turned on straight away at his shop. He suggested I get a UPS to ...
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1answer
27 views

How can I check if my MacBook Pro is shut down without turning it back on?

Sometimes I like to shut down my Macbook Pro (e.g. if I know I won't be using it for some time and I want to save battery). Unfortuantely, I can't figure out any way to actually check that it's shut ...
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1answer
45 views

Does the Mac mini (2018) deliver power over Thunderbolt ports?

Thunderbolt ports can optionally provide power, up to 100 watts. Does the Mac mini (2018) provide any power over any of its four Thunderbolt ports? If so, how many watts? On which of the 4 ports? ...
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2answers
270 views

MagSafe: Where is the charger ID stored?

I'm about to change my power adapter's cable due to the classic cable fraying. However, according to this, there's data that gets passed around using the 1-Wire protocol. I only see 2 wires on there....
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1answer
29 views

Charging suddenly stop when I try to use the device

It's my first time with a mac computer, I have a macbook pro 2011 . The problem , charger works fine when the laptop is closed or idle, when I start using it like for example opening Finder, simply ...
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2answers
46 views

How can I charge my MacBook Pro at work?

I have a 15" 2019 MBP and want to be able to charge it at work without carrying my adapter and cable back and forth. At work I have a Dell OptiPlex 7050 and two Dell monitors (one is HDMI, the other ...
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2answers
86 views

What is the voltage output of an Apple 85W MagSafe 2 model A1424 without a load?

I’m looking to understand how to test and evaluate chargers so this is a bit technical a problem. Since MagSafe is proprietary, I can’t consult a USB power distribution specification to know how ...
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1answer
32 views

How can I ground this charger

This charger came with my MacBbook Pro which I bought from India. The other end is connected to the magsafe adapter's ground pin. What do I need to insert here?
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35 views

Macbook Air Mid 2012 A1466 Power button not working

Thanks for stopping by. As the title states, when I press the power button on the keyboard, nothing happens. This is a ongoing problem I've had for a couple months now and it's starting to get on my ...
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1answer
18 views

What input voltages does the 85W Magsafe 2 power adapter accept?

I have an 85W Magsafe 2 (A1242, MD506LL) power adapter which has been happily driving my MacBook Pro from US and Canadian 110V AC power. I am about to take this power adapter to Europe. Will I be able ...
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16 views

Macbook Pro (Mid 2015) won't turn on even without battery connected, Magsafe light is amber

My Macbook Pro (Mid 2015) won't turn on. I recently replaced the keyboard and after putting everything back together and turning it on, the condition of the battery said "replace now", i didn't have ...
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2answers
144 views

Is there a USB-C PoE adapter for iPad Pro?

Is there a dongle which plugs into the USB-C port on the iPad Pro that accepts Power over Ethernet (PoE) so when PoE is available there’s no need to plug an additional USB-C cable to provide power to ...
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0answers
39 views

MacBook Pro late 2013 (Model: A1502) won't boot or respond to any Input

I have a big problem with my MacBook Pro late 2013 it does not boot or light up in any way. Current behavior The only reaction that I get is, when I connect it to the powercord and start with the ...
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0answers
29 views

Is there a way to easily test the speed and power capacity of a USB-C cable?

Specifically in a macOS / iOS household (i.e. not looking for solutions that calls for Windows software). I have a number from varying sources and definitely they are not equal. For example: The C-...
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2answers
47 views

What to do if MacBook Pro 2017 uses more wattage than the charger can give?

I wanted to ask, what to do if MacBook Pro 2017 uses more wattage than the charger can give? Why I am asking this or thinking this might be a problem? I tried to play some games on BootCamp (playing ...
2
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1answer
56 views

Disabling a specific system notification?

My Macbook Air 13" (macOS 10.13.6) has a USB problem which triggers a warning notification every five minutes: Looking in the Console, I see lots of "overcurrent detected" warnings; testing the two ...
2
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1answer
59 views

Macbook battery bar showing as red; battery % jumps around; battery condition normal; out of US charging

I've been in Europe since 7/5. I've been charging my 2015 macbook pro (purchased in the US) in the UK from 7/5-7/11 and in Italy from 7/11-current. I use a power adapter (not a converter) since the US ...
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1answer
54 views

What do the various USB 'current' labels under macOS System Report mean?

Could someone please clarify what the following values under System Report > USB mean. I am using an iMac 5K 2019 Current Available Current Required Extra Operating Current Sleep current Also, what ...
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39 views

Lightning cable pitted contacts fix?

Lightning cables are expensive, and I have 2 of them which are in great shape except that they are failing because of pitted contacts. That is, the gold metal of one of the 8 leads has been removed, ...
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0answers
64 views

Standard charger for Macbook Pro insufficient [duplicate]

I recently bought a MacBook Pro (15-inch, 2018) and I am using the OOTB Power Adaptor (87W) and USB-C cable. I am finding that when I run computationally expensive processes (e.g. I utilize multiple ...
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1answer
23 views

MacBook Pro goes into hibernation immediately after login, how do I fix this?

My Mid 2012 MacBook Pro, goes into hibernation immediately after logging in. Battery indicator still shows around 95% charges when it does that. When I plug in and reboot, battery shows 0%. This does ...
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0answers
23 views

Fully charged 2015 MacBook Air shuts down instantly when disconnected from power

My father is using an Early 2015 MacBook Air (i5 Dual-core, 128GB SSD, 4GB RAM). He's been using it without any problem since the day he bought it, until it started turning off instantly the minute he ...
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2answers
77 views

Mac Air (2015) keeps shutting off immediately after being unplugged from charger

My air which is 4 years old now keeps shutting off immediately if it gets disconnected from the charger. It won't even turn on if it's not plugged in. It started happening about a month ago randomly, ...
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35 views

iPhone 5 issues while charging

When charging my iPhone 5 while it's switched off, the charging indicator does not disappear (or go to Sleep) and is therefore visible the whole time. And, when charging my iPhone 5 while it's not ...
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1answer
99 views

MacBook Pro: Battery icon shows as charging even when not connected to power source

I have a 13" 2017 MacBook Pro no Touch Bar model. It is not connected to a power source but it still shows as charging. While this is not affecting my Mac's performance or anything, but now I don't ...
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0answers
30 views

MacBook Pro restores last user session after shutdown because of low battery

I had only one account on my MBP. I created a new account on it for my son and he has his own password. I was logged-in with an open session on my account. I closed the lid and left it there, ...
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0answers
21 views

MacBook pro won't stay on and has difficulties powering up

MacBook pro 13" touchbar from 2016. The MacBook sometimes will turn on, most of the time it won't. When it does turn on, I can get as far as the login screen, where it will completely shut off after ...
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0answers
29 views

MacBook Pro 15 2017 and power banks

I travel a lot, so I came to the conclusion that a power bank made for charging laptops is a good solution when wall-plug is not an option. The question is how many full charges can I expect to have ...
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2answers
38 views

Is there ANY disadvantages of charging MBP 13" with a powerbank that outputs 10W?

Device is Macbook Pro 2015 13". It has 74.9 Wh battery. Its original adapter is 60W. While charging the device will stay turned off. If its allowed, I'll link an example powerbank. Its 25000mAh / 92....
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1answer
398 views

USB to MagSafe 2 Adapter

In case of an emergency, I'd like to use my solar powerbank to charge my Macbook 2015 13". It outputs 2.1A 5V, and I learned that the MBP can be charged with that, but I don't know if that's actually ...
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47 views

Issue with turning on MacBook by pressing the power button

My MacBook Pro (mid 2012) is not turning on by pressing the power button. After referring some of the youtube videos I removed and connected the battery pin. By doing so my MacBook is turning on ...
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3answers
73 views

MacBook Pro only charges with smaller MagSafe 60W

My MacBook Pro 2.3ghz i7 mid-2012 stopped charging and the light on the charger doesn’t show up anymore. I thought it was the MagSafe 85W and got a new one, but my MBP is still not charging. The ...
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0answers
36 views

2018 Mac Mini - Won't boot when power applied

I work in an environment where power is turned off to the building nightly. On previous revisions of the Mac Mini, I was able to get them to automatically boot when power is applied (in the mornings) ...
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1answer
128 views

iMac tripping breaker just by plugging it to electricity, without even pushing the power button!

iMac 21” (EMC: 2638) The iMac was connected to a UPS but through an extension cable, so not directly. So the iMac was running as usual when suddenly it went off, with all the other devices that are ...
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1answer
48 views

How can I charge powerbank that has single C-type in/out from MacBook?

I’m using Xiaomi Power Bank 3 which has following sockets: USB-A type low output USB-A type high output USB-C type power delivery input/output up to 45W It usually works fine, I can use MacBook ...
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1answer
41 views

Macbook battery runs flat while “charging” with nearly full USB Brick

Road warriors buy Macbooks for untethered working and at times find themselves in a place without a powerpoint. So charging a Macbook from a USB Brick is a fundamental operational requirement. I ...
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0answers
38 views

Is there a way to power up a 2017 MacBook Pro (non Touch Bar) with a bad keyboard?

A friend of mine has asked me to take a look and see if I can bring their 2017 MacBook Pro (13", non Touch Bar) back to life. Apparently the cause of death was that a glass of wine was spilled on the ...
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2answers
789 views

My MacBook Pro doesn’t wake up after sleep mode

I have a MacBook Pro 13" (2013). After it goes into sleep it does not wake up. I see the tabulator key light goes on if I press it, but the monitor stays black. I can only restart the Mac by pushing ...
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2answers
324 views

Should a 3m cable charge speed be significantly different than a 1m cable?

I recently bought a 3m (meter) Apple charging cable and found that it was charging my iPad slower than usual. I plugged it to a USB tester and found that it charged at ~5v 1A. By comparison, my 1m ...
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1answer
34 views

Does a power cord use energy when it is not pugged into a Mac?

Does a power cord use energy when it is not pugged into a Mac? In other words, in order to save energy, should I pull the power cord out of the wall after my Mac has been recharged?
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32 views

Can I add a jumper from charger to battery in a MacBook pro 2012 that is not charging?

The proposed solution to a non charging MacBook. Will this work? Add a jumper from charger to battery, this is to bypass current sensing circuitry and SMC. All, or some of which may be the root cause ...
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1answer
286 views

MacBook chargers turns green, then red, and then stops charger

I have been using a MacBook charger for about 6 months, and now I tried to use another one which I have used before with this MacBook. Now, the battery is low enough that the MacBook can’t start, ...
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1answer
2k views

iPad mini won't turn on/charge

I have had my iPad mini for a long time, and it's been having issues for the past year. Whenever I let it completely loose power, it takes forever to actually turn back on. When I have it plugged in, ...
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0answers
30 views

How to see if a remotely controlled Mac is powered off completely

I have an 13 inch MacBook Pro which I run with closed lid all the time over a VNC connection. To power it on, I power up the mains adapter and the energy settings on the Mac are configured so that ...
2
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1answer
35 views

Can a MacBook Pro 13 (Mid-2010) battery be used in a 2009 unibody polycarbonate MacBook?

I have one somewhere, I just don't have it on me. I'm just curious because my MacBook Pro died but has a new battery, and my 2009 MacBook has a dead battery. I'd rather not buy a new one if I don't ...
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0answers
51 views

Skipping battery level screen when powering on MacBook Pro with Touch ID button

My MacBook Pro used to turn on automatically when I opened the lid. I didnt like that so I disabled that feature. Now I can manually turn on the macbook but it requires a couple button presses and a ...
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1answer
43 views

MacBook Pro not loading although power adapter is connected

I own a new MacBook Pro (bought three weeks ago). Since I don't want to exhaust the 1000 expected full charge cycles this battery is rated at, I connect the MacBook with the power adapter when I'm ...
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0answers
31 views

2017 MacBook Air suddenly wouldn't turn on/wake up

My MacBook Air drained out of power. Now when I plug it in, it wouldn't start. I have tried resetting the SMC and NVRAM. One peculiar thing that I noticed is that the MagSafe power cable is showing ...