Questions tagged [power]

The electricity drained by a device

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1answer
1k views

PowerBook G4 PMU Reset Required

I have to do a PMU reset to turn on my G4 PowerBook (1.25 GHz). This occurs on every shutdown of the system. What are potential causes of this? I'm perfectly happy to troubleshoot, but on Google I'...
5
votes
1answer
14k views

MacBook Pro Charger has stopped working properly - any short-term fixes?

I have a MacBook Pro 15", about a year old. Today, the charger started working only intermittently. I've seen a few other people talking about similar problems, and most people say it's a problem with ...
20
votes
4answers
23k views

How to monitor USB power consumption?

I'm looking for a way to monitor the power being drawn from the USB ports on my Mac. System Profiler doesn't appear to display this and I haven't been able to find any applications or tools to do the ...
0
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2answers
2k views

Why is my Mac “falling asleep” when it's told not to?

MY power settings are for "NEVER" when it comes to sleeping with AC power. AC power is always on. So why always when I come to the Mac after hours of being away, it awakes from sleep, loads up all the ...
6
votes
2answers
882 views

Xserve shuts itself off and boots at will

Okay, there's a lot of smart Mac guys here, so lets see if any of you can figure out this stumper. Our Xserve G4 (RackMac1,1) went incommunicado a few years ago was left in this state until I pulled ...
3
votes
3answers
10k views

My iphone always restarts by itself

My iPhone often restarts automatically. It happens when I charge for long time and sometimes, it happens when I'm talking on phone .
7
votes
1answer
4k views

Does powertop work with Mac OS X Snow Leopard or are there other power profiling utilities?

I recently came across a blog post highlighting powertop for Linux (see: http://www.lesswatts.org/projects/powertop/). Based on the FAQ, powertop relies on the fact that the Linux kernel is now ...
10
votes
2answers
960 views

Why can my Mac charge my iPad but other computers can't?

What do Macs do differently so its USB ports can charge my iPad, but if I plug into a USB port on my PC I get the "not charging" message?
5
votes
2answers
6k views

For least power usage, should I turn off or put my Mac to sleep?

If I'm not going to be using my Mac for a while, am I better off shutting it down completely or just putting it to sleep? Obviously it uses more power to "sleep" than to be off completely, but it ...
68
votes
10answers
151k views

Can I use 45/60/85W MacBook chargers interchangeably?

I have a 13" Macbook Pro that came with a 60W power adapter and a 15" Macbook Pro that came with a 85W power adapter. Can I use either adapter with either laptop? There seems to be disagreement in the ...
2
votes
5answers
5k views

I think I have bricked my MacBook Pro, what are my options to get it fixed?

I have been having power issues with my MacBook Pro (late 2007?). The power cable had a dodgy connection, and kept cutting out. This destroyed the life of the battery to the point where it would only ...
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1answer
1k views

Does latest MacBook Air have powered USB ports?

I see that the latest 13 inch MacBook Air has two USB 2.0 ports, but can they power, say, a 2.5 inch external hard drive?
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6answers
7k views

Power adapter connection issues

Lately, my Magsafe power adapter has not been connecting properly: The wires are not worn out as I take good care of them The issue happens when I try to connect my power adapter to my computer The ...
0
votes
1answer
307 views

International Power Converter

I am going out of th country in a few weeks, and I am planning on taking my Macbook. I have a power adapter for the country I'm visiting, but it was bought for a PC. Will it work on a Mac?
0
votes
2answers
2k views

MacBook will not turn on

I have a MacBook pro and it won't turn on. Basically I press the power button and the White light at the front turns on. Then a few seconds later it just crashes and the White light goes off then the ...
12
votes
5answers
56k views

Keep iPhone Screen On (when plugged in)

Is there an app (normal, jailbreak) that will keep my iPhone (3GS, OS 4.x) screen on, indefinitely, when it is plugged in, regardless of what app is running in the foreground?
6
votes
1answer
381 views

Mac display won't turn on

I have an Apple HD display that has been in our IT depart for a few months now. It was working fine until recently (the past month or two). I can turn it on and it will work for a few days, but then ...
3
votes
2answers
16k views

Is there a presentation mode on mac?

When watching a video, or making a presentation, is there an option or a tool to disable all screensaving, energy savings and all? Regardless of if the power is plugged, I'd like to keep the screen ...
2
votes
1answer
648 views

iPod Touch 4th Gen dock with AC or USB power and audio out?

I have scoured the internet looking for a dock that will allow me to charge an iPod Touch 4th Gen which includes a jack to connect it to an external stereo system. I understand this can be ...
12
votes
2answers
7k views

Should I use the adapter or the battery?

I want to know when my MBP's battery was fully charged it's better to unplug my adapter and use my battery power or still let use adapter power? I somewhere read that when MBP's battery was fully ...
3
votes
1answer
8k views

Why does battery die during sleep mode?

I'm running MacOSX 10.5.8 on a MacBook Pro. I was working on my computer last night. I finished work, closed the lid and expected the computer to go to sleep. I assume this is the Apple Safe Sleep ...
23
votes
4answers
22k views

Why does GPS on the iPhone use so much power?

I keep reading in articles that GPS on the iPhone, or any cell phone for that matter, uses a lot of power, but I've never heard an explanation of why. Why is this? The phone doesn't have to transmit ...
2
votes
4answers
237 views

New powercord for MacBook

I am considering going on eBay to try and buy a new powercord for my MacBook. I know that phones often advise that you only use the official charger, so I was wondering if the same warning applied for ...
2
votes
1answer
1k views

Battery or power adapter problem?

I have a problem charging my battery. When I plug my power adapter into my MacBook Pro, the power adapter's light turns green (it doesn't change to orange) and my monitor light turns on (which means ...
29
votes
5answers
63k views

Is it OK to charge my iPhone with my iPad charger?

I have an iPhone 4 and an iPad. Since the iPad really charges best off the wall charger I keep it plugged in, but I usually just charge the iPhone off the computer. Although frequently if the iPad ...
20
votes
7answers
29k views

iPad displays “Not Charging” when plugged into USB ports. What can I do?

When I plug my iPad into my computer's USB ports, the iPad battery area displays "Not Charging". I understand the iPad requires more wattage to charge compared to an iPhone or iPod, as evidenced by ...
17
votes
4answers
10k views

What's the point of the 60W Apple MagSafe replacement charger?

One of the cable tabs on my MagSafe charger for my MacBook came undone, so I took this as a sign to retire the charger to home use and to purchase another for travel. When I went to my local Best Buy, ...