Questions tagged [power]

The electricity drained by a device

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1answer
26 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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23 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
11 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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15 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
89 views
+50

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
33 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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1answer
34 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 ...
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1answer
51 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 ...
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1answer
44 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
42 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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30 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
50 views

Standard charger for Macbook Pro insufficient

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
21 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
50 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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0answers
34 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
39 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
28 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
19 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
37 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
243 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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34 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
70 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
35 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
111 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
43 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
39 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
36 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
561 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
259 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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30 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
158 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
1k 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
43 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
37 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
27 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 ...
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0answers
13 views

Mid 2013 MacBook Air charging fine but the light on the cord is out

I tried resetting the SMC as I saw this repeatedly being suggested as the solution but this did nothing. Computer charges fine but any light on the cord is out. Any other suggestions? Am I damaging ...
1
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1answer
26 views

iPhone won’t shut off

My iPhone 5s just randomly stopped allowing me to shut it off with the power button. I don’t understand why but every single article online says that it’s a relatively common problem and the way to ...
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2answers
39 views

MacBook booting to black screen

I am currently unable to boot my Late 2013 MacBook Pro. When I attempt to boot, the backlight comes on, but there is no image on the screen. When I try to boot into Safe Mode (by holding Shift), ...
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2answers
530 views

Does “Prevent computer from sleeping…” remain in effect even if I close the lid?

These are the default settings for when a Mac laptop is plugged in: Notice how the display will be turned off automatically after 10 minutes of inactivity, and the ”Prevent computer from sleeping…” ...
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2answers
1k views

13" MacBook Pro 2017 randomly shutting down

I bought a new Mac and have had it it for like 1 week now. I noticed it turns itself off at 8% but I wasn't worried. Then it started shutting down on like 17%-20% cca. When you plug charging cable ...
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1answer
49 views

How can I troubleshoot Macbook pro 13 with touch bar model 2017 that won’t start?

I took my Mac on vacation where it was working fine. Upon return, I opened it up and nothing; no start or any sound. I tried all the tricks of soft keys but nothing. I don't understand what went ...
5
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1answer
270 views

iPhone 7 Plus takes days to turn on showing Apple logo or black screen

I’ve had this issue for months but in the last couple of days it’s got very very bad. When my phone runs out of battery it needs like 2–3 days to turn back on. At the beginning of this problem the ...
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5answers
7k views

Can I charge a 2017 MacBook Pro with a third-party USB C power adaptor?

I've got a 2017 MacBook Pro which comes stock with an 87W USB C Power Adapter. I want to purchase an additional power adapter, but I don't require an official Apple one. I notice that Anker make one ...
2
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2answers
108 views

Macbook battery [duplicate]

I have a macbook pro 2010 15 inch A1286. My problem is that the power adapter is plugged into the MacBook but it indicates that the battery is not charging and "Power Source: Power Adapter". The ...