Questions tagged [power]

The electricity drained by a device

42 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
5
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 ...
3
votes
1answer
2k views

Customize external HDD spindown timeout?

It's possible to enable spinning down of mechanical hard drives using the "Put hard disks to sleep when possible" option in Energy Saver, and it's possible to customize the timeout period with sudo ...
2
votes
0answers
104 views

Magsafe problem: only works in certain positions

I recently bought a brand-new, genuine Magsafe 60W charger for my mid-2010 MBP (my previous charger died suddenly after months of extreme fraying). Within a few hours of using it, strange and bad ...
2
votes
0answers
1k views

iPad Pro Won't Turn On

iPad Pro was fully charged. Upon going to bed I set alarms as usual. No alarm in morning and iPad will not turn on. When I try to recharge the back gets quite warm. I tried restarting by pushing both ...
2
votes
0answers
20 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
0answers
30 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
0answers
207 views

Macbook Pro 13" mid-2012 AC power turns off and on while plugged in

I have a MacBook Pro 13" Mid-2012. Charges fine. But while using it with AC power adapter, and connected to an external monitor, the AC power randomly cuts out (stops charging, cord light goes out, ...
2
votes
0answers
850 views

How to avoid external display going off after I unplug a MacBook from the AC Power?

When I have my MacBook Pro 10.10 connected to the AC Power my external display connected through HDMI works fine. As soon I disconnect the MacBook from the AC Power and start running on battery, my ...
2
votes
0answers
515 views

Turn off keyboard lights after typing

I have my computer (MBP 2015) to turn the backlight on my keyboard off after I haven't used my computer for 10 seconds. Is there a way how to disable the keyboard backlight after x amount of seconds ...
2
votes
0answers
113 views

The power button turns MacBook off, but not back on

I have: replaced/soldered a new keyboard connector on the logic board as it had a missing pin, replaced the keyboard twice (the second and third keyboards work correctly), tried jump starting the ...
2
votes
0answers
112 views

Find out what adaptor power socket an unopened iPhone 5s has

I have an unboxed iPhone5s here, which I have received as a gift from a friend who also received it as a gift and did not want it. I might end up regifting it myself, so I would rather not open it. ...
2
votes
0answers
931 views

reverse magsafe adapter? (magsafe2 power to magsafe1 laptop)

I have some magsafe2 power cords. That's fine, but occasionally I need to loan power to an older laptop that has the magsafe1 port. I carry a magsafe2 adapter so I can steal power from them. But is ...
2
votes
0answers
380 views

Pop-up notification (or notification center notification) for battery in OS X Mountain Lion

I don't have the battery/AC icon turned on because, for the most part, there's no reason for it to be there - I typically get cord-free 5 or so hours at a time, so it seems redundant. Still, ...
1
vote
0answers
41 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 ...
1
vote
0answers
20 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 ...
1
vote
0answers
26 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, ...
1
vote
0answers
18 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 ...
1
vote
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 ...
1
vote
0answers
34 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) ...
1
vote
0answers
34 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 ...
1
vote
0answers
28 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 ...
1
vote
0answers
38 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 ...
1
vote
0answers
22 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 ...
1
vote
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
vote
0answers
50 views

MBP 2015 Sierra strange behaviour while hibernating

I noticed that my MBP early 2015 with Sierra OS X drained a battery quite a lot overnight. I did some research and my pmset settings are like this: Here is a screenshot of pmset -g log | grep ...
1
vote
0answers
265 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
0answers
281 views

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

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 ...
1
vote
0answers
181 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 ...
1
vote
0answers
62 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 ...
1
vote
0answers
49 views

My iPad mini from apple isn't turning on

I have a mini iPad from apple for a few years now and never once has it played up. This morning however it refused to turn on (it was working fine last night). I have been charging it almost all day ...
1
vote
0answers
251 views

What API does iStat Menu use? (Mac power system sensors)

I am writing a script to procedurally measure certain power system parameters. I am aware of system_profiler SPPowerDataType. However, this API only updates once a minute and sometimes provides ...
1
vote
0answers
266 views

MagSafe 2 frequently broken

I've got a MacBook Pro (Retina, Mid 2012), once in a longer period of time my MagSafe 2 adapter simply fries. Just a minute ago I fried the third MagSafe 2 adapter in three years time. It occurs with ...
1
vote
0answers
157 views

MBP Powering Down When Idle

My mid-2012 MacBookPro (Model 9,2) has developed an issue with power in the past few weeks. When it is left awake for several hours, but is idle, it powers off. When I turn it back on and log in, it ...
1
vote
1answer
170 views

MacBook shows it is charging when MagSafe is green

My MacBook currently shows this even though the MagSafe charger has a green light. Does anyone know why this is? If it helps I am on a MacBook Air late 2010 with 819 cycle counts, 4,995mAh (...
0
votes
0answers
24 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, ...
0
votes
0answers
32 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 ...
0
votes
0answers
29 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 ...
0
votes
0answers
24 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 ...
0
votes
0answers
123 views

iPhone stops charging randomly after fully drained battery

I have an iPhone 7 Plus in good condition. Today it was connected to my Mac (I'm an app developer, I was debugging an app) and noticed that my iPhone wasn't charging. My app was debugging properly (...
0
votes
0answers
906 views

MagSafe light turns out orange after few seconds

Is it normal for MagSafe to have orange light (not directly to be green light) 3-4 seconds after plugged to outlet ? I'm a bit nervous with this matter as I've just bought a new mbp after my ...
0
votes
0answers
679 views

Quickly dim the iPod Touch by hitting the power button twice on the lock screen?

I've always wondered if this was a feature or not. When I'm on my iPod Touch's lock screen, then I hit the power button twice, the first hit will sleep the device, the second will wake it again but ...
0
votes
0answers
515 views

How to put MacBook Pro to sleep when the lid is closed and you remove the power?

I think I have a common use case that is not properly handle by Lion. If I close the lid and remove the power supply, my macbook is not going to sleep mode and stays awake draining the battery. It's ...