Questions tagged [power]

The electricity drained by a device

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7
votes
4answers
12k views

Keep low power mode on all the time

I would like Low Power Mode to be the default state of my device. When I get to 80% battery it toggles itself off automatically. How can I stop it turning itself off? How can I always keep my phone ...
1
vote
1answer
616 views

Burned magsafe dc in board ports: Replace, even if working?

I have noticed that two of the pin plugs on my magsafe dc in board, the ones, which are for power are blacked. As far as I know, this is due to moisture. Right now everything is working fine, however ...
3
votes
3answers
3k views

How safe is it to replace the magsafe 2 connector with another one by simply connecting the wires?

I have a problem with my magsafe 2 adaptor, it has been stopping to work occasionally for a while now. Until now I always managed to get it to work by yanking the cable (in order to unstuck the pins), ...
1
vote
1answer
2k views

What would happen if I plug in two USB-C power supplies into the same Mac? Would it charge faster? [duplicate]

I have a bunch of USB-C power supplies (some at different wattages). Would my Mac charge faster (or blow up) if I plug two power supplies into the same computer (different USB-C slots)
0
votes
2answers
274 views

Does it look like a Fake iPhone 6 or original? Specially The accessories. I'm confused with power adapter (rounded Pin)

Does it look like a Fake iPhone 6 or original? Specially The accessories. I'm confused with power adapter (rounded Pin). I have only this two images. Thanks I just needed info on the USB charging ...
1
vote
0answers
346 views

MacBook Pro A1278 keyboard works but power button doesn't

I have a MacBook Pro (mid 2012) A1278. All the keys work except the power button. I've tried different keyboards (i.e., plugging in internal keyboards to test the power button). None of the keyboards ...
1
vote
1answer
39 views

Mac runs as long as plugged in, but unpredictably shuts off otherwise - clock resets

I have a MacBook Pro, as shown in the image below. Also, as I think it might use a lot of power, I run Ubuntu on a vagrant machine to test website apps. Recently (last 2-3 months), the battery would ...
3
votes
1answer
354 views

My MacBook Pro touch bar 13" isn't starting

My MacBook Pro touch bar 13" isn't starting and here's what I'm seeing: 1) No power - I can't hear blowers or any sound or see any activity on the backlight when I press the power button/touch ID 2) ...
2
votes
1answer
231 views

Power consumption of iMac

All other things being equal, what is the difference in power consumption of iMac with 8GB of RAM and iMac with 16 GB RAM?
2
votes
2answers
300 views

How to backup SSD if MacBook doesn't turn on?

I have a MacBook Pro 15" Mid 2015 and after 3 years of using it, I think it is broken since it won't power on. I already tried resetting SMC and NVRAM but it's still not working. I don't hear any ...
4
votes
1answer
1k views

USB-C Power Injector

I was wondering if a device exists for this yet: I have a normal screen that currently as an AUKEY HDMI to USB-C running from it to my 2017 MacBook Pro. It works well. I charge the laptop with the ...
0
votes
1answer
654 views

Does IFTTT app drain battery faster in iPhone (and Apple Watch)?

The IFTTT app sounds interesting with endless possibilities. I have just installed it but skeptical about using it because of the possibility of battery drain. The app has to keep track of every event ...
1
vote
1answer
9k views

What is the maximum wattage an iPhone X will support for wireless charging?

The existing chargers on the market are all either 5W or 7.5W for their charging capacity. While higher capacity chargers dont exist on the market, what is the theoretical maximum that an iPhone X ...
2
votes
0answers
21 views

MacBook early 2009 power issue?

I have been on here quite a lot with all my issues. I have a project MacBook (early 2009, a1181, which is running OSX High sierra and Ubuntu along with a bootloader, refit or fEFInd, can't remember at ...
2
votes
1answer
56 views

Is it safe to use 2 Power sources into a MacBook Pro 2016 15"

I have a 4k monitor that has power over usb-c but it is only supplying 15W instead of what it advertised of 60W. So I was wondering if I could charge my Mac with its 87W power supply while having the ...
2
votes
2answers
4k views

MacBook Air won't power on

My MacBook Air won't turn on. I plugged in the charger and it says it's charging. When I turn it on, the light instantly turns green for a few seconds, and then it goes to amber. What's going on? I ...
2
votes
2answers
4k views

iMac with a dead internal drive being used as a second monitor - booting and power efficiency

I have an old 2012 iMac12,2 which had a fatal hard drive crash in early 2018 and has been running via booting from an external hard drive. I have connected the 2012 Model to a new 2017 iMac18,3 via a ...
4
votes
2answers
5k views

Macbook Pro Battery 0% and wrong date

Model: MacBook Pro Retina, 13-inch, Early 2015 While I was working, I didn't realize that the battery was low and as a result, my MacBook Pro shut down when the battery had no power. So, then I ...
1
vote
1answer
193 views

On iPhone 5s, can the battery itself be the cause of fast draining, even after a brand new U2 chip is installed?

My battery was draining very fast even when UNUSED and in LOW POWER MODE. This was happening even in AIRPLANE mode (i.e. overnight, unused, in Airplane and Low Power Modes both enabled). I got the ...
4
votes
1answer
155 views

Change what percentage/time remaining causes the battery icon on Mac to go red

I'm dead broke. So, I have a cheap battery for my dead-broke-esque 2008 MacBook. It only lasts about 2 hours on a full charge. However, it's a little goofy at times. Not in a dangerous way, just that ...
7
votes
1answer
1k views

Are Macbook Pros with a rusted / corroded MagSafe port safe to operate?

So I have MacBook Pro 13" 2015 and when I connect the MagSafe power connector to it, it seems like it’s more difficult to charge. So I check the MagSafe port and want to clean it I think. When I ...
1
vote
0answers
339 views

My iMac automatically/mysteriously powers off when on standby. How can I make it not power off? [closed]

Our iMac randomly powers off while on standby. I put it to sleep, come back, and it is powered off. I need to reboot it, which is a long process. The iMac is at the newest operating system and it is ...
2
votes
0answers
31 views

iPhone not recognized by MacBook 12"

I want to connect an iPhone 6 to my 2016 12" MacBook. I have a USB-C to USB-A adapter. If I connect the iPhone, macOS shows a warning (translated): USB device requires power (Note: It just says power,...
2
votes
1answer
6k views

Do I need a voltage converter for Japan, for MacBooks or USB devices?

Japan uses 100V; I will be in parts of the country using both 50Hz and 60Hz. Will I need a voltage converter for a) a MacBook power supply, b) a standard AC-to-USB plug? I live in the U.S.
1
vote
1answer
232 views

What happens if I use a 60W rated USB-C cable to charge my Macbook from the 85W power brick?

Will they still be able to negotiate the correct charging amount of 60W and not overload the cable?
3
votes
1answer
1k views

A1502 Late 2013 MacBook Pro will not boot, one exception

The ONLY time it's booted since it's been in my possession was when it was in the Apple Store, when it ran the Apple Diagnostics. What I've tried is: resetting the SMC (no reaction) using power on ...
3
votes
1answer
180 views

Late 2008 13" MacBook not detecting brand new battery

I bought a broken late 2008 13" Aluminum Unibody MacBook on eBay. Supposedly, according to the listing, Apple had said the original battery needed to be replaced. The other issue was the slightly-...
2
votes
3answers
72 views

Did Sierra's latest security update brick my device?

I have an mbp mid-2012 running the latest Sierra. I installed the latest update which attempted to restart the machine. The usual progress bar was showing and then it shut off. Curiously, it didn't ...
10
votes
3answers
32k views

“Battery not charging” on MacBook Pro

I have the infamous "battery not charging" problem on my 2014 Retina MacBook Pro. The power source shows as "Power source: power adapter". I checked system info and I have 1100+ cycles, which I guess ...
3
votes
1answer
2k views

Shut down system without superuser permission

The following command causes an immediate system sleep pmset sleepnow Trying to shutdown system with pmset $ pmset shutdown Usage: pmset <options> See pmset(1) for details: 'man pmset' ...
1
vote
0answers
14 views

Power button does not work! MBP 2011 [duplicate]

Overnight, my MBP would not power on with the power button. The Battery was full and the LED on the charger was green. SMC Reset did not bring any results. So I opend up the Mac, disconnected and ...
1
vote
0answers
56 views

early 2015 13 inch macbook air shuts off when disconnected to power [duplicate]

my macbook air shuts down 0-30 seconds after I unplug it from the magsafe. the computer says it's at 90%, and charging; I did an SMC reset, ran apple diagnostics (no issues detected), cleaned the ...
2
votes
0answers
309 views

Can I force my MacBook to only charge from the USB-C device I select? Or forbid it from charging from devices I know to be unreliable?

For some reason, my MacBook keeps trying to charge off of my external display's USB Type-C ("USB-C") link even though I have a more powerful source connected. I care because the monitor is ...
2
votes
2answers
8k views

MacBook randomly shuts down [duplicate]

This is likely the same problem I saw reported countless times. However, mine comes with a twist, so I wonder if anyone can provide extra insight. Briefly, my laptop randomly shuts down (I think it ...
2
votes
1answer
58 views

iMac 5k 2014 won't boot/turn on

Looking for ideas on how to fix my iMac, it's a 5k 2014 that will no longer boot. It all started one morning when I'd put it to sleep the evening before, when trying to wake it, nothing happened, and ...
1
vote
1answer
108 views

After heavy use, my big iPad has charged very slowly. What can I do besides the Genius Bar? Is there a different wall charger I should use?

During an inpatient stay, I had my 12.9” iPad Pro(Model A1652 EMC 2827), which I tried to use much of the time I was awake. The battery was depleted most of the time: I had it plugged into a wall ...
6
votes
1answer
5k views

Double sound notification when plugging in iPhone X with Fast Charge

I recently purchased an iPhone X, and along with it I also purchased a 29W USB-C Power Adapter and a USB-C—Lightning cable. This setup is supposed to enable Fast Charging of the iPhone X. However, ...
6
votes
0answers
1k views

Iphone 6+ USB disconnects from Macbook Pro constantly over and over

My iPhone keeps disconnecting from my MacBook Pro; in fact any iPhone I try to connect (and with different cables) can never connect to it. I am very familiar with command line and Linux so please if ...
9
votes
1answer
811 views

How to select power direction over USB-C

I have a USB battery which has a USB-C port on it. When I connect it to my MacBook Pro (regardless of whether the MacBook Pro is running off its battery or via the mains), the Mac doesn't charge the ...
1
vote
1answer
24 views

Phone data security when plugged in to hotel power supply

is it true that only Apple chargers are secure from data theft from your phone through electrical systems such as in a hotel or coffee shop? I was told that you should never use a non-Apple phone or ...
1
vote
0answers
66 views

Weird Linux and/or MagSafe charger glitch

This is... confusing to say the least. A few months ago, the battery in my 2010/2011 MacBook Pro completely died, complete with a Permanent Failure Flag. Today, I replaced it, and things are really ...
0
votes
1answer
548 views

MacBook Pro 2016 won't charge even on power adapter

I'm using the CalDigit USB-C Dock and the Mac said it is using the power adapter, but my battery is slowly draining: I did an SMC reset and reset PRAM (NVRAM) but still won't charge. Why isn't my ...
2
votes
2answers
1k views

Is it okay to use non-OEM USB-C cable and/or adapter for Macbook Pro?

Is there anything special about the Apple USB-C cable, other than its quality, that would prevent me from using a USB-C cable from another brand? And the same question for the wall adapter.
2
votes
2answers
680 views

Macbook Power Adapter Prongs Burnt

I was travelling in China with my Macbook and USB-C Power Adapter. While plugged in at a hotel, the prongs of adapter got burnt. Is it okay to just replace the prongs, or is it likely that the ...
4
votes
1answer
3k views

What happens if I plug both sides of one USB-C cable from one MBP port to another of its ports?

I've got a MacBook Pro 13" 2017 - two USB-C Thunderbolt 3 ports. It came with a standard USB-C cable to support power supply. If I plug this cable into both USB-C Thunderbolt 3 ports the Mac seems to ...
2
votes
1answer
57 views

Wifi Problems when Notebook not connected to power source

I have a Macbook Pro 2016 that is connected to 2 external monitors via Thunerbolt. When my Macbook is not connected to power supply, I can connect to the wifi with good signal strength but loading ...
1
vote
1answer
337 views

Will two charging cables charge my laptop twice as quickly? [duplicate]

Now that the MacBook has all of its ports the same, is it possible to plug in two power cables into the Mac? If I do so, will it charge twice as quickly? In the event that the Mac is unable to allow ...
3
votes
3answers
26k views

2013 MacBook Air 13" won't boot - green MagSafe LED

I have a 2013 Macbook Air that suddenly won't boot. It was working as of yesterday. I woke up this morning and it wouldn't start. At the time, the Magsafe2 Adapter was not lit up. My wife has a ...
4
votes
2answers
104 views

How Can I Stop My Mac From Reopening Applications After A Power Failure?

I live in the woods and lose power frequently. When this happens, MacOS tries to restore every application that was open when the power went out. I don't want it to do this. How do i prevent this from ...
7
votes
1answer
11k views

USB type-C ports max power supply from MacBook Pro?

What are the max power supplied by Apple's touch bar MacBook Pro from its USB type-C ports?