The electricity drained by a device

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1answer
915 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 ...
14
votes
6answers
22k 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
3k 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
8k 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
286 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
10k 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
4k 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 ...
7
votes
3answers
18k views

Can i use my old MacBook charger on my new Mac?

I have a 2011 15" MBP, that uses a 85W power supply. My old 2008 MBP 15" also has a 85W power supply, but I cannot get it to work. Shouldnt it? Its the same watt power, and the adapter fits.
1
vote
1answer
917 views

iMac sounds like it's starting up then shutting down immediately

I have an iMac. Since yesterday, it has been making sounds where it seems like a hard drive is starting up then shutting down immediately. However, that can't be possible of course because the ...
0
votes
1answer
591 views

Is grounding important?

Is the grounding wire forwarded to the Magsafe connector? There are these 2/3 pin adapters and it's so much easier to convert a 2 prong connector while travelling than the bulky three prong ones. I do ...
5
votes
1answer
1k views

Are the mid-2012 Macbook Air compatible with older MagSafe adapters?

Will the mid-2012 Macbook Air models be compatible with the MagSafe power supply of the previous generations?
2
votes
1answer
387 views

Can I use a foreign power cord to power my MacBook?

I have a MacBook Pro computer and I will be traveling abroad to Hong Kong for studies. The electric sockets and voltage are different than here in the US so I would have to use a converter but it is a ...
4
votes
1answer
90 views

Energy saver: do the battery settings apply during charging?

I have my Macbook pro 17 (early 2011, OSX 10.6.8) set to turn off the display at 30 minutes on AC, and 10 minutes on battery. I've noticed recently that if the battery is charging (the little battery ...
0
votes
1answer
815 views

Old MacBook power adapter on new MacBook Pro?

I have a 60W power adapter from my old 2008 MacBook. Can I use this power adapter on a new 13" MacBook Pro, which also came with a 60W power adapter? However the two power adapters have two ...
8
votes
4answers
10k views

What is the iPhone's standby policy regarding WiFi and 3G?

I have an iPhone 4s with the latest iOS. It seems that when I wake it up from standby, it switches from 3G (or EDGE) to WiFi. Judging from that, I suspect it turns off WiFi when in standby, and only ...
6
votes
1answer
400 views

At what point do iPads stop displaying “not charging” when connected to power?

I am curious if anyone has measured directly or found an authoritative reference that documents at which point the various iPad will display charging and not "not charging" in the menu bar while ...
6
votes
3answers
3k views

Using my iMac in a country with a different power supply standard

We may be relocating to a different area of the world where the power standards and outlets differ considerably from what I've got here in North America. Is the power supply in my iMac ...
8
votes
4answers
6k views

Does an iPad consume more battery power when there are multiple applications open?

Does an iPad consume more battery power when there are multiple applications open compared to let's say, having only one application resident in memory? If there are differences between the ...
2
votes
2answers
5k views

Does having Bluetooth enabled draw extra power when no devices are connected?

I generally turn off Bluetooth on my Macs and iOS devices when I'm not actively using a Bluetooth device. My assumption is that this saves battery life, but I realize that I have no fact to back that ...
5
votes
2answers
27k views

Is it safe to use my US iPhone/iPad charger with a simple European plug adapter?

I'm using the US wall adapter that came with my iPhone to charge it: When I travel to Europe, is it safe to use this with a simple US-European adapter, or do I need a transformer or some other ...
1
vote
2answers
2k views

What is the wattage of my iPhone?

I am trying to make a transportable charger for iPhones, but before I can start this I need to know how much power my iPhone uses when I make an emergency call. If nobody knows this, I will be glad ...
3
votes
1answer
627 views

Why do I have to reboot my iMac and Wacom Cintiq after sleep?

I have an iMac and a 24 inch Wacom Cintiq. When I put the iMac to sleep, it freezes and I have to restart both the iMac and the Wacom Cintiq. How can I get around this?
6
votes
1answer
4k views

Easy way to disable processor cores on the fly

Hey i'm looking for a fast way to disable processor cores of my macbook to save power when i'm stranded away from a charger. I'm away that instruments can do this from it's preferences, but that's a ...
3
votes
1answer
273 views

What is the data corruption risk of force shutting down a running Mac?

Eg when the power supply is cut or someone presses the power button for 5 seconds? How big of a risk am I taking to my data? Is it a 1% chance of corrupting data? I know most mac these days have a ...
3
votes
4answers
2k views

Is there a safe way to shut down a Mac that doesn't have a keyboard or mouse?

I'm trying to safely shutdown a Mac desktop that does not have a keyboard or mouse connected to it any more, after hardware damage to the only keyboard and mouse in the house. It also does not have ...
1
vote
2answers
1k views

My battery is not charged. The only way to operate is to plug the computer in

My battery says 0% charge, there is no x over my battery icon. The MacBook runs fine on corded power but dies as soon as I unplug. What could be the problem?
6
votes
3answers
17k views

Does closing the lid put a MacBook Pro to sleep? Would it hurt the computer if I carry it around without shutting it down?

When I first got my MacBook Pro, it took less than 30 seconds to start up. Now, after several months, it takes about two minutes to startup and I can tell that it is not as responsive when using some ...
1
vote
1answer
148 views

macbook - low power from the command line

I often (for example on the train) want to put my macbook into a state that will maximise the amount of time I have before the battery runs out - so far example I'll switch off the bluetooth, then ...
4
votes
1answer
444 views

Can you power on a MacBook with a wireless keyboard?

Is it possible to power on a MacBook using a wireless keyboard? If that sounds strange, I'm asking because I use a Bose radio as the sound system and the radio fits nicely on top of the laptop.
1
vote
2answers
983 views

Macbook Air (13" 2012) Fails to wake from sleep

The Air doesn't wake up from sleep mode when the lid is closed. Have to do a hard restart by pressing the power button for 5 secs which isn't nice. Tried to select the startup disk from system ...
3
votes
1answer
328 views

85W MagSafe adapter only delivers 77W?

My late 2011 17" MBP was delivered with an 85W MagSafe adapter. Under heavy stress (either CPU and/or GPU) the MBP has to draw additional power from the battery in order to keep everything running. ...
5
votes
2answers
14k views

How do you check how much current a Mac USB port can deliver?

This question is similar to the superuser question "How to check how much power a USB port can deliver", which is answered for Linux and Windows. How do you check the same on a Mac?
1
vote
1answer
196 views

Late 2008 MacBook Pro no longer wakes up on its own

Plain and simple here: about one week ago, my MacBook Pro stopped adhering to its wake schedule. I have had it set to wake every weekday at 6 a.m. for as long as I can remember. It has done so with ...
1
vote
2answers
897 views

Will a MacBook Pro (15-inch, Mid 2010) power up in clamshell mode?

Although part of my problem is covered here - Powering on while the lid is closed in clamshell mode, it alone doesn't solve my query. I'm trying to turn my MBP into a server, and because of that I ...
4
votes
7answers
7k views

Is my MagSafe covered under my MacBook's AppleCare?

I have a white 2010 MacBook, and the outer casing for the wire on the MagSafe power adapter has developed a small split. Is this something that may be covered under my MacBook's AppleCare? Is it ...
3
votes
2answers
1k views

Battery issue with MacBook Pro 13 inch (Early 2011)

So, around June 2011 I finally had the chance to buy my first Macbook Pro (13 inches, i5) But recently, I've noticed something wrong with my battery! Actually with only 2 months of use, I was under ...
3
votes
3answers
7k views

Can I safely charge an iPhone 4S with a 5V 2A source?

I just bought a New Trent IMP99D external battery, to keep my phone alive while gaming during long-haul flights. It has two USB ports to connect to, one which supplies 1 amp at 5 volts, another which ...
4
votes
2answers
157 views

Unexplainable large number of cycles of MacBook Battery

My battery is a year old, but it has 189 cycles. Why is this? I always use my MacBook with the charger plugged in and very rarely without the charger.
8
votes
6answers
36k views

“USB device drawing too much power” error on startup with no devices connected

Since upgrading to Lion, I get this error every time I start up: I've read the answers suggested here, but they seem to indicate that it's the presence of a second device that's causing the ...
2
votes
3answers
4k views

I have a 2008 Macbook Pro will a 85w power cord work?

I have a 2008 Macbook Pro and my cat recently chew through that power cord. I bought a 85w adpater but I don't want to open it if I know it won't work. Does an 85w work with a 2008 Macbook pro or ...
2
votes
1answer
410 views

iOS app for toggling bluetooth when iPhone is plugged into dock

Are there any apps that will toggle bluetooth on/off when the phone is plugged or unplugged from power? I only use bluetooth in my car when it is plugged in the dock so that is the only time I would ...
3
votes
4answers
1k views

MacBook won't sleep while charging

An ongoing problem: my MacBook Pro (i5, 2.4ghz, 15") won't sleep while charging. I close the lid, but I don't get the pulsing "sleep light", it just stays fully illuminated. If I listen closely, I ...
6
votes
2answers
6k views

Monitoring power consumption on Mac

The Android OS monitors the power consumption of running apps and hardware (display). As you may guess, this is a useful feature as it allows to track down energy greedy apps. Is there an application ...
4
votes
1answer
691 views

Should I spin down Mac Mini's drive?

I have a Mac Mini (2010) that I use as a home server with a DAS (2 drives) attached over USB. Everything is on 24/7. From all my research online, it seems that spinning hard drives up and down ...
2
votes
1answer
1k views

Are there no explicit Power modes in Mac?

Does Macbook Pro not provide power modes (Power Saver, High Performance, etc) like a Windows laptop? If there is nothing like that, then I'd assume that OS X manages optimal settings itself. Or is ...
2
votes
3answers
1k views

MacBook Pro shuts down when unplugged

I have a late 2008 MacBook Pro work computer. Here's the sequence of events: I fully charge the battery I unplug the Mac from the power cable The Mac immediately shuts down Before unplugging the ...
0
votes
3answers
2k views

App to shut down iPhone 3G

Is there an app to shut down my iPhone 3G? It's a non jailbroken iPhone and the power button isn't working anymore. So I need to shut it down with an app. Any advice?
5
votes
1answer
1k views

Is there a way to get the OSX battery icon to display both percentage and time?

I am working on a 2006 MacBook with Snow Leopard. The battery level indicator has the option to show Time or Percentage remaining. I would like to show both. Is there a way to enable this? or Can ...