Questions tagged [power]

The electricity drained by a device

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1answer
15k views

MacBook Air charging light stays amber and does not go green and machine does not boot or even chime

I have an 11" MacBook Air 6,1 from mid 2013 that I found discarded and had restored but now seems dead again. I got the machine with a broken screen backlight and missing SSD. I took it to the Genius ...
4
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1answer
3k views

Turn off USB power on OS X/Mac Mini

I have a need to turn USB power off (and on) using a script or a piece of software. Ideally it should be possible to turn each port off/on separately, but also turning power off/on from all ports at ...
1
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2answers
1k views

Debugging charging problem with MacBook Pro

I have a MacBook Pro (unibody late 2008 15") A few weeks ago the charger was causing hassle and eventually the connector came loose. The MacBook eventually lost power. Then, I asked my friend for ...
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1answer
125 views

What is the maximum safe current for Mac Pro PSU?

I regularly put my 2010 Mac Pro under pretty heavy usage, maxing out the 12 core CPUs and GTX Titan Black. I can monitor the voltage and current using iStat Menus, but I'm looking for a specification ...
1
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1answer
67 views

OK to power off Apple TV (4th gen) at the mains when not in use?

I've just given an Apple TV (4th gen) to a relative, who is in the habit of powering off the whole TV system (TV, DVD player, stereo etc) when it isn't in use. Is it OK to: remove power from the ...
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2answers
391 views

Any way to turn on the reduced power mode a macbook uses under battery power, but while plugged into a power adapter?

I have an external battery rigged up for my MBP. It goes through the magsafe adapter. The battery is about twice the capacity of the internal battery. The problem is, the macbook thinks it is ...
2
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1answer
1k views

iMac 27' powering off without reason

I have been the owner of an iMac 27' for the past 3 years. I have had the problem of the machine automatically powering off (for no reason at all) since almost day 1. After trying everything, ...
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2answers
4k views

At how many battery cycles should I consider replacing my battery?

My battery has become quite a pain in the neck recently, It's not lasting much more than about 2 or 3 hours and that's usually just using basic programs like chrome or pages etc. It's difficult for me ...
0
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1answer
83 views

MBP 2010 15" won't boot without disconnecting power and battery

My MBP 2010 will only power-up if I disconnect power and battery, and then only connect power. When I shut it down, it'll only power up again if I remove the power first for >10 seconds. I've tried ...
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1answer
11k views

MacBook Air won't power on, except I remove the battery and plug it back in (SMC reset?) - sleep works

I have a bizarre problem with my 2012 MacBook Air 13": At some point, a couple of weeks ago, it suddenly stopped turning on. The battery would charge, but pressing the power-button just wouldn't have ...
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2answers
2k views

Can I charge my battery with a higher wattage charger than what came with device

Will it hurt my battery to use a 12w charger instead of a 10w that came with my iPad Air 2. iPhone charger says 12w can I use this on my iPad air2
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1answer
312 views

mid-2012 Macbook Pro Retina 15" won't recognize new adapter

I recently bought a new power adapter off Amazon, and it worked with my mid-2014 MBP at work and my colleague's mid-2014 MBP, but not my mid-2012 MBP Retina 15" (which, frustratingly, it was bought as ...
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1answer
620 views

Is there a way to get live power usage

I'd like to monitor how much power is being used by my Mac. The tools I've found so far either list the maximum power (85W for my laptop charger) or the processor's usage (Intel's Power Gadget). I'd ...
0
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1answer
239 views

Macbook Air recognizes battery while starting, but later says “no battery available” (battery icon X)

I spilled a full glass of water on the keyboard of my Macbook Air 11" mid-2011 (running OS X Mavericks). After drying everything out, etc., here's what happens when I start the laptop: It has to be ...
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2answers
442 views

MacBook Air 2012 won't charge or boot

I have a Mid 2012 11" MacBook Air that won't charge or boot. I've tested the charger with multiple other MacBook Airs, and the charger works fine. I have researched this and have done everything from ...
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2answers
90 views

MacBook Pro never goes to sleep

I got a brand new mid-2015 MacBook Pro 15", OSX 10.11.3. Display never turns off even it is configured to turn off after 10 mins in power adapter AND in battery mode. Screen saver (aerial) stays ...
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2answers
969 views

Battery not charging? (Even after SMC reset)

So, I've seen a couple topics like this that already exist, but none solved my problem. I plug in my charge to my 13-Inch MacBook Air, Early 2015, and the LED light did not turn on, and the battery ...
1
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1answer
805 views

Is it safe to swap the “duckhead” connector from an old power supply to a new MagSafe 2?

Working from home today and I just pulled my macbook pro out to realize that I left the "duckhead" part of my magsafe 2 power supply (85W) sitting on my desk when I left the office last night. I ...
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2answers
82 views

Make Mac boot upon plugging in power

I have a MacBook and I'd like it to boot automatically upon plugging it into a power source. Is there a way to do this?
3
votes
1answer
2k views

How to disable the “this cable or accessory is not certified” message on iPhone?

The message "this cable or accessory is not certified and may not work reliably with this iPhone" pops up whenever I use a 3rd party USB cable for it. It's really annoying, because then I'd have to ...
0
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1answer
457 views

Can a 3.7 Watt LiPo battery trigger the charging symbol on an iPhone?

I am trying to use a 3.7 Volt 1 Amp (so it's 3.7 Watts) Lithium Polymer battery to charge or at least trigger the charging symbol on an iPhone 5. I have charged the battery fully using the Lithium ...
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1answer
212 views

Splice a 45W MagSafe 2 connector onto an 85W PSU?

I have an unused 45W MacBook Air MagSafe 2 PSU, and an 85W MagSafe 1 PSU that my dog chewed the connector off. I'm wondering if splicing the MagSafe 2 connector onto the 85W PSU would allow a MacBook ...
3
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2answers
5k views

Mac does not automatically restart when power is re-applied after `shutdown -hu now`

I want to have a Mac Mini automatically boot when power is applied, as I cannot conveniently reach its power button, because it resides inside an art installation, where the power will be shut down ...
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1answer
1k views

How to eliminate noise on iPad analog/headphone output?

I'm a musician with a home studio. I've been wanting to incorporate my iOS devices (iPad 3, iPad mini retina, and iPhone 4s) into my music making for years, but only recently have synchronization and ...
1
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1answer
38 views

If I buy a power adapter from the online Australian Apple Store, will it match Australian outlets?

I want a power adapter for a MacBook Air that matches Australian outlets (without a separate adapter). It seems reasonable that if I buy such a thing from http://www.apple.com/au, it will have the ...
3
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2answers
1k views

Explanation for wrong charging wattage / slow charging?

I have a 2013 Retina MBP and a fairly new 85 W Magsafe 2 charger. But when I connect this charger to my Macbook and check in Battery Health, it claims that it is receiving only 49 W. Does anyone know ...
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1answer
1k views

MacBook Pro Boots only with a pressed key

I'm having a bizarre issue with my early 2011 Macbook 15'. I grabbed it today without battery power só the first thing I diz was to plug the MagSafe adapter. Afterwards I pressed the power button. It ...
39
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4answers
20k views

Use caffeinate to prevent sleep on lid close on battery

The native caffeinate utility is not working to prevent my macbook from sleeping when I close the display. Instead, the system sleeps and various network services ( VPN, screenshares, VOIP calls, ...
2
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2answers
9k views

Macbook Pro (Mid 2012) Battery Not Charging

I have a Macbook Pro (Mid 2012) 13" unibody and having issues with a battery that is not charging. Here are the specifics: Battery is not charging Magsafe light not illuminating at all Macbook is ...
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2answers
829 views

MacBook Pro battery will not charge even though cycle count is below max count

I haven't used my MacBook Pro (Mid 2011 version with non-removable battery) for over 6 months, as I was out of country. Now it only works on power connected and battery won't change. Symptoms I ...
4
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2answers
608 views

Is it safe to discharge my body's static electricity onto my MacBook Pro?

Often in the winter (low humidity), getting up from and sitting down onto the seat at my desk, or taking off a jacket, and such will build up a static electric charge on my body. Sometimes I don't ...
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2answers
88 views

Current power consumption [duplicate]

Is there a way to know the current (or average power consumption) on OS X (a Mac Mini without battery). Preferred would be a command line tool but anything is OK.
1
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1answer
32 views

MacBook power cable with mounting holes

my question is, if there is MacBook power cable with mounting holes. I think better picture than thousand words, I mean this power cable end: with mounting holes, somehow like this:
2
votes
1answer
982 views

Why doesn't a stripped/cracked MagSafe power cable shock?

Behold, the fate of all (poorly handled) MagSafe power cables: Why doesn't this shock me? I've read that MagSafe cables are low voltage, but I don't even get a tingle. Is there any danger of shock, ...
9
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4answers
40k views

Can I (or should I) use a MacBook charger on my iPhone?

I recently got a MacBook with the USB-C charger. It comes with a 29-watt power brick, and I was wondering if I should use this to charge my iPhone. I've heard that the iPad power brick (I think 10 ...
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1answer
156 views

Battery cannot charge fully

I replaced battery on my MBA mid 2011 (A1369). Here is the report by coconut(the same appears in system report): I bought no name battery from china and changed it personally (here they ask about ...
2
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1answer
1k views

My (unbroken) iPhone won't turn on!

I have an iPhone 5. The only issue it's had is that the battery life wasn't so great as it once was... until now. Earlier the battery went flat and it switched to this screen Totally normal. So I ...
2
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1answer
2k views

Can I unplug my Mac mini from power once it's in hibernate mode?

Suppose I want to work on my Mac mini here, reach a certain point in my work, then put it in hibernate mode and unplug the power. From what I understand the hibernate mode will save the status of the ...
2
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1answer
1k views

How to turn MacBook Air 2015 on if the power button is broken and I don't have tools to remove battery?

The power button on my macbook air 2015 is not functional and I don't have the correct screwdriver to open the back up and take out the battery. Is it possible to turn the laptop on without having to ...
1
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1answer
262 views

Fixing Mac Mini that uses 10x normal power in sleep mode

When I return to my Mac Mini in the morning, the case is warm to the touch, even though at that point it's been sleeping for hours with the display off. According to https://www.apple.com/environment/...
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1answer
212 views

Magsafe charger behaving strange

I have a Macbook Pro 15 late 2011. The charger has started to act funky the last few days. What happens is that I connect it. Light shows as green on the connector and then switches to orange if it ...
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3answers
2k views

85W MagSafe adapter has stopped working

Yesterday I noticed that my 85W MagSafe adapter had stopped working. I usually leave it plugged in constantly to my MacBook Pro (but not constantly on at the switch). The LED on the plug that ...
0
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1answer
231 views

How to prevent MacBook Pro from sleeping with turned off external display?

I have two displays connected to my MacBook Pro Retina 2015, running 10.10. It is connected to power, so it will not sleep once I close the lid. However, if I am doing long during calculations over ...
1
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1answer
419 views

Taking care of your Mac (put into a sleep or shutting down)

I have read this article but I would also like to know what are your thoughts and opinions on that point. I have my MBP with 16 GB RAM and SSD drive. I would like to put my Mac into sleep rather than ...
0
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1answer
271 views

Is something on the IO logic board burnt or..?

yesterday, i plugged my macbook pro to charge, and my magsafe charger got a little burn where it connects to the magsafe charger (wall->magsafe). Now my macbook pro won't charge, no light, no nothing, ...
2
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1answer
160 views

Why do I feel 'electricity' when bridging my macbook and a double insulated charger?

Let me set the scene: Macbook with metal case plugged into the wall with 3 pronged plug iPhone is plugged into an iPad charger with 2 prongs When I touch both my iPhone and the case of my macbook I ...
0
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1answer
3k views

iPad won't turn on after being drained [duplicate]

What if my iPad didn't turn on after battery drain? I did all the steps but it still didn't work. Is it already damaged or can I recover it on an Apple Store?
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1answer
57 views

MacBook Pro 13' Power cord

I use a 6 outlet adapter on my wall outlet. Since it's on the wall, it gets loose sometimes. This morning I pushed it in, while my power cord was plugged into it and the the power cord was plugged ...
1
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0answers
270 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 ...
2
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0answers
869 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 ...