Tagged Questions

The electricity drained by a device

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1
vote
1answer
588 views

iPhone 4 cannot be charged via power supply after iOS 7 update

Using an iPhone 4 and a original power supply (a1357) + cable (usb) i am not able to charge the phone. However connecting my phone to the pc (windows) it will be recognized and charge. This ...
0
votes
2answers
293 views

How to charge the MacBook Pro from 12 Volts?

Aim: I would like to charge my MacBook Pro (MBP) form a 12V lead-acid battery. However there are no official chargers from Apple for that purpose. There exist quite some alternative products on the ...
0
votes
1answer
144 views

Is there a way to view and control the powerstate of the discrete GPU on a 2011 MBP in OSX?

I noticed that running with the discrete GPU uses more power and generates more heat. I just need the discrete GPU to drive an external monitor, I'm not concerned about performance. By controling the ...
1
vote
0answers
372 views

Dim LED on Magsafe, Macbook Pro won't boot

I have a Macbook Pro late 2008, and today, it suddenly decided to stop booting. The battery level is very low, and connecting the adapter to it shows a very dim green light on the Magsafe connector. ...
13
votes
3answers
3k views

Can I restore pre-Mavericks power key behavior?

Mavericks changed the behavior of my MacBook Air's power key to put the Air to sleep immediately when pressed briefly. Prior to Mavericks, the power key would summon the Shut Down dialog. As ...
3
votes
1answer
2k views

Magsafe light occasionally turns off while plugged in

Every once in a while, the green light on my Magsafe adapter will turn off, but the computer will indicate that it's still running off of AC power. If I unplug the adapter from the computer and then ...
1
vote
1answer
123 views

IOS 7 Power Drain

What settings minimize power loss on a 4S? I upgraded to IOS 7 and have noticed a signiicant power drain
0
votes
1answer
116 views

Charge iOS device through mains whilst using data cable with laptop

Take two Apple data sync wires: Cable 1, which connects the iPad to a laptop USB port, and Cable 2, only connected by itself to an iOS data charger socket plugged into the mains, ready to ...
5
votes
1answer
2k views

iPod classic 80GB won't charge from usb power adapter

iPod classic 80GB 2007 [Model No.:A1238] won't charge from LG usb travel adapter (output 5.0V, 0.85A). It normally charged from Apple 5W USB Power Adapter [Model No.:A1299] (output 5.0V, 1A), and ...
0
votes
2answers
91 views

MacBook Pro Hibernates Straight Away

Whenever my Mac goes to sleep when its on battery, it straight away saves its contents to the hard drive and powers off, going into a deep sleep. This gets really annoying when I walk away for 10 ...
0
votes
1answer
119 views

Mac book charger

Will using a 45w charger on my mac book pro 13 that came with a 60w charger cause operating problems? Sine using a 45w charger my laptop cannot get past the grey/white loading screen?
1
vote
2answers
713 views

How to reduce MacBook Air 2013 1.7GHz CPU power consumption?

I'm seeking a way to reduce MacBook Air 2013 1.7GHz CPU power consumption -- or any MacBook for that matter -- to save battery life. I want to vary the CPU power consumption variably, so that I can ...
0
votes
0answers
695 views

Plugged faulty USB into Mac Air, won't turn on

I have an external DVD drive with an AC power input. I plugged it into a power source and then into my Mac Air (the generation released a year ago). The computer shut down immediately. When I ...
1
vote
0answers
135 views

Can an iPad be charged while acting as a USB host?

I have an iPad that I would like to leave semi-permanently connected to a USB hub (connected to a couple of MIDI controllers and some USB speakers). As it stands, I have to remember to unplug it ...
12
votes
3answers
751 views
+100

How does Apple calculate the energy consumption of a process in OS X Mavericks

In OS X Mavericks you can monitor the energy consumption of different processes in Activity Monitor. Here we can see 'Energy Impact' and Avg Energy Impact' and that the values can exceed 100. Also ...
2
votes
3answers
6k views

Out of warranty MBP ,Burned Magsafe port and frayed charger cable - repair option and cost?

I have a MBP 15" 2011 model and has is the burned magsafe port (leftmost pin melted) which i noticed today. The connector gets too hot sometimes ( but remains ok when I charge in sleep mode). ...
0
votes
4answers
602 views

Macbook Air power saving with Thunderbolt to Gigabit adapter

I am considering buying a Thunderbolt to Gigabit adapter to save my MBA power consumption as I can shutdown the Wifi, assume it use a lot of power. Anyone tried before and it works? How many % of ...
0
votes
1answer
2k views

iPod 5 charger isn't working! What do I do?

I have A ipod 5. Every time I go to charge it with a dynex or apple charger it doesn't charge. The bar stays red for over an hour. I'm thinking that I have a short in my charger. I don't know what to ...
2
votes
0answers
275 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 ...
0
votes
0answers
296 views

Macbook randomly shuts down without on charge (even at ~90% full)

I'm having a real issue with my Macbook (white, late 2009 version, running Lion OS X). It was about since 2 weeks ago or so, my Macbook would just randomly shut down, I lost a couple unsaved files ...
2
votes
1answer
417 views

No power through USB for Roland A-49

I just plugged my Roland A-49 to my MacBook Pro (Early 2011 2.3 GHz). The MIDI keyboard would have its power supplied via USB, but it has no power. The specification says it needs 98 mA current, which ...
0
votes
0answers
521 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
1answer
269 views

Macbook Air 1,1 power consumption

I have the original MBA, and I have extremely high power consumption - see the screenshot (screenshot got while TextEdit only was running) Is is normal for original MBA?
1
vote
1answer
362 views

know how many watts a USB device is consuming [duplicate]

I know it's possible to do some electric hack to know how much current a device is using... but that would be a 1 time usage so it would be a waste of money and parts. Is it possible to know that ...
1
vote
1answer
169 views

Will one power adapter work with all shipping MacBook Air and Pro as of March 2013?

I have a Late-2008 Macbook White (MacBook4,1) model, and my AC Adapter broke. Now I want to buy replacement adapter, but since I am going to upgrade to a MBP13 or MBP15 in the next 1-2 years, I want ...
1
vote
2answers
123 views

Electricity coming through screws, USB, and headphone jack on 2009 MacBook

I've seen some online threads and at least one StackExchange question on this, but the answers don't seem to apply to my situation. I have a 2009-vintage white 13" MacBook that's always been in great ...
0
votes
1answer
186 views

What are some effective ways to save power when using my MacBook Pro?

I have an Early 2011 MacBook Pro (Core i7, 8GB RAM) with Mountain Lion (OS X 10.8.2). What are some effective ways to save power? I am looking to maximise use of the battery - from a full charge - on ...
1
vote
1answer
127 views

Which Power Adapter is the correct one for Powerbook G4 15inch FW800 - 45watts or 65watts

I have a Powerbook G4 15inch FW800 with a 45watts Apple style power adapter. Recently it would not boot up. I removed the battery and it did. However after a shutdown, later on it did not boot up ...
1
vote
0answers
2k views

iPad 4 not charging solution with usb 3.0 dual ports Y adapter

Just recently picked up an iPad 4. Saw that it specifies "not charging" when plugged into the usb port. Saw that it is a common issue due to usb power. I have usb 3.0 ports on my desktop so I tried ...
0
votes
1answer
283 views

Sleep button broken. How do I find out which part is affected?

The sleep/power button of my iPhone 4 is broken; it suddently didn't really "click" anymore and just hardly reacted on my actions. For some hours by clicking really firm it still worked, but then the ...
0
votes
1answer
970 views

Macbook Pro Mid 2010 not powering up after smc update

Macbook Pro Mid 2010 after SMC update 1.7 shuts down and now by pressing power button front light turning on for a few seconds, optical drive makes it's usual noise but no activity on monitor happens ...
1
vote
1answer
3k views

How much power does Apple TV use on standby?

I just bought a third-gen Apple TV, and I don't want to have to open Settings to put it to sleep every time I'm done using it. It seems it won't fall asleep automatically for quite some time, so I'd ...
1
vote
0answers
517 views

Fluctuating voltage on Magsafe charger

I got two Apple Magsafe charges, one for which I needed to cut and rejoint the cables. The fix went well and now when I plug in the charger it works and charges my Macbook Pro. Though when I measured ...
0
votes
1answer
389 views

MacBook Pro battery charging stops early

I have a Mac Book Pro 15" over a year now. I'm having a problem with charging the battery. During work it stops charging and goes to battery powered mode. If I switch to a different power source it ...
0
votes
3answers
5k views

Macbook Air short Battery Life

I purchased Macbook Air 13 in late 2012. It is advertised as having 7 hour battery life. After a few months of use, with maximum charge it gives me only 2 hours. Is this normal?
1
vote
0answers
176 views

How to identify the 3 thermals sensor connectors from the mac mini motherboard?

I opened my mac mini to switch the DVD with another hard drive and I forgot to take a picture with the ways the 3 thermal sensors are connected. THeir codes on the mainboard look like: J5550 - left ...
2
votes
2answers
949 views

iMac + uTorrent energy saving

I want to keep my iMac on tonight and seed/leech torrents. I usually leave it there until, after 5/10 min or so, the iMac turn the monitor off. I can still hear the hd working. uTorrent has an option ...
2
votes
6answers
11k views

Best replacement for MacBook Air MagSafe 2 cable (OEM or 3rd party?)

My MagSafe 2 cable for my 2012 MacBook Air stopped working. Took it into Apple store where I had bought my MacBook Air, and sure enough it was the excessive cat chew marks that had degraded it*. Can ...
10
votes
2answers
9k views

How can I keep my Mac awake AND locked?

I want to leave my Mac awake overnight so it syncs 4GB of data from Dropbox. I need to prevent the machine from going to sleep because that pauses the Dropbox sync I've been using Caffeine to keep ...
1
vote
1answer
405 views

How to use new Macbook Air's power adapter with previous generation MacBook Pro?

I have a MacBook Air (Late 2012), which has the new Magsafe 2 power connector. I would like to use the power adapter with my 15" MacBook Pro (Mid 2010). Is there an adapter for it? A quick search on ...
10
votes
1answer
212 views

Macbook started to consume battery more quickly

This seemed to happen after I did several things at once (all of which I have since reversed in trying to track this down): installed a (Crucial M4) SSD drive (replacing my old SATA 5400 RPM drive), ...
1
vote
1answer
748 views

Can I still use a damaged Magsafe power cable?

My rabbit chewed on my Magsafe 2 power adapter. I can see the silvery wire where the rabbit peeled off the isolation yet it still works. Can I just duct tape it and continue using it or is there any ...
12
votes
6answers
17k views

What would happen if I use a Macbook Air Powersupply with a 15" MacBook Pro Retina (or vice versa)

My girlfriend has a Macbook Air. The power supply is smaller and lighter than the Pro. It has an output of 14.85V and 3.05Amps. My Pro Retina has a power supply that is 20V and 4.25 Amps. Both ...
1
vote
1answer
2k views

Force hibernate (deep sleep) in OSX 10.8(.2)

How can you force the computer (in this case a laptop [rMBP]) into the "hibernate" state where it writes the RAM to the HDD/SSD so that the battery can last for the advertised 30 days. I know that ...
8
votes
1answer
2k views

Phone-only mode on iPhone

Is there a way to switch the iPhone’s functionality to a phone-only mode. In this mode only incoming (and possibly outgoing) calls and SMS messaging would be activated. All other services (location, ...
0
votes
2answers
1k views

Should I use an extension power cord instead?

I have the following Apple MacBook Pro Power adapter: 60W MagSafe PV85 Ouptput 16.5v--3.65A ADP-60AD T Model No. A1344 Instead of buying a Power Adapter, is it ok to buy an Extension power ...
2
votes
3answers
7k views

Retina macbook max USB power output

Could someone tell me how much Ampere the retina macbook pro can deliver over usb. I thought that one should be able to charge an ipad with a retina macbook which would mean, that it should be about ...
2
votes
0answers
277 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, ...
6
votes
3answers
9k views

How do I locate applications that drain my battery on a MacBook Pro?

I purchased a new Macbook Pro and have since downloaded a ton of applications and add ins. I think some of these apps are responsible for draining my battery too quickly. How do I identify what ...
1
vote
1answer
3k views

How can I force my laptop to shut down when I close the lid?

I'd like my Mac laptops to shut down completely when I close the lid. This is partly for convenience and partly for security reasons. I couldn't find a way to do this in the System Preferences (OS ...