Crash when power supply is removed

During the last week my computer has been doing something really weird. Sometimes when I disconnect the power supply, my computer will freeze up/get into the window that tels you that you need to restart the computer. I installed a new hard drive about 2 months ago and a new airport card like 2-3 weeks ago so that most likely is not the problem. The problem occurs wether or not I have charge left on my computer.

Hi Pedro,
The first point of call for strange power related problems (or any problem really is to reset the PMU, following the instructions on this page - http://docs.info.apple.com/article.html?artnum=14449
Regarding your other comments, regardless of your skill level (and to consider doing a hard drive swap in a 12 inch powerbook, you obviously have a fair bit) you may find that in re-assembly a cable has shorted somewhere or is not plugged in tightly, or something of that nature, so I would not immediately rule that out as a cause.

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Satellite Pro S300L-105 - Whistle when power supply is removed

I recently bought a Satellite Pro S300L-105, it works normally except that it produces a slight, pointed whistle, witch can be heard when the power supply is removed. After less than 10 minutes using, I feel pain to my ears and brain and it becomes unusable.
I do not have any hearing problem or so. and I've never had such a problem when using any other computer.
What is it due to, and what can the manufacturer do for me?

Hi
Very common problem with all sorts of electronic equipment.
The whistle is caused by the high frequencies used by switch mode power supplies. It's a bit like a car where you have a rattle that happens only at certain speeds, and that speed creates a certain frequency that resonates with something in the car that then makes a noise. The same thing happens in the power supply.
When you remove the power the laptop enters a different power mode and starts running things on a lower voltage to save the battery power, and the way the power supply does this is by changing the frequency the power supply runs at. This frequency is just right to cause something to start vibrating within it, and as the frequencies are very high, you get a high frequency squeal. It may be so high in frequency other people can't hear it, which can be a problem when support or the shop are checking are it if you take it back.
Just like a car with a rattle, not every car of the same type will have the problem and the same goes for laptops. Someone may have a squeal only when on mains power for example, or only when the back light is on full or on dim, or they just don't notice it.
The manufacturers do a lot to try and dampen down anything that might vibrate and squeal but are not always successful.
You might find turning off power management settings help as the power supply is then forced to supply more power and so the frequency shifts to one that doesn't cause a squeal, but then you will find battery power doesn't last as long.
It could easily go away after a few weeks or months and never come back, or could get worse.
Mostly the noise isn't any sign of an impending problem or breakdown.
Getting the laptop replaced will most likely get you one that doesn't squeal.
Hope that information helps a bit, I know it can drive you mad when you get a high frequency squeal, and even madder when other people can't hear as their hearing isn't as good.
The same sorts of noise are now used in areas where children hang out causing trouble, a high frequency noise is blasted out at a frequency that most adults can no longer hear but children can as it drives them insane, so if you can here the squeal and others can't that is quite normal and shows if anything you have younger hearing or are indeed younger.
Regards
Phil
Message was edited by: Philip_l

MacBook Pro crash when power cord is removed

When the power cord is disconnected the computer shuts off within about 0 to 15 minutes.
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Rebecca ...
Try Resetting the System Management Controller (SMC)
And check here > Apple Portables: Troubleshooting MagSafe adapters

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G580- Screen blacks out when power supply is not plugged in to the laptop

My laptop is just 3 months old and I am already having problems with it.
The laptop screen blacks out when i remove the power supply from it.
When plugged in , it starts workin again.
Whats the point of a laptop if i am not able to use it without plugging in??
I don kno what the probelm is. Can anyone help here pls...
Cheers
Vaish

Hi Vaish,
I’d like to help you with this issue as we can try to increase the Brightness of the screen from the power options while plugged in,
And then please if still the same we can try to uninstall the Lenovo Energy management and reinstall it back:
Lenovo Energy Management for Microsoft Windows 8
Lenovo Energy Management for Microsoft Windows 7
Hope the information helps. Let us know.
Regards
Soha
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https://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T540p-Intermittent-power-supply-connector/...
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Hi Thomas
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Hi
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Cisco Power Supply error

What does out of regulation limits means ?
1 red "OUTPUT FAIL," normally is off but illuminates when power supply outputs are out of regulation limits
Thanks
Rosa

Hi,
Seet this:
LED
Meaning
INPUT OK
AC-input power supplies:
•Green—Source AC voltage is OK. (Input voltage is 85 VAC or greater.)
•Off—Source AC voltage falls below 70 VAC, is not present, or the PEM is turned off.
DC-input power supplies:
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FAN OK
Green—Power supply fan is operating properly.
Off—Power supply fan failure is detected.
OUTPUT FAIL
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http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/hardware/Chassis_Installation/Cat6500/0apwsply.html#wp1025570
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hmmmm. i haven't seen many 0x8Es showing up under these circumstances. so we're in general-principles-troubleshooting mode here.
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... but let's also capture a minidump of the crash and send it to the Discussions Hosts, so they can throw it over the fence for an Apple Engineer to analyze.
To set up your machine to capture a minidump, right click on "My Computer", select "Properties", select the "Advanced" tab, select the "Startup and Recovery" Settings button, select "small memory dump" from the popup. When it crashes, look for the MiniDump file. It's usually in the folder "C:\WINDOWS\Minidump" and is called something like Mini<number>-<number>.dmp.
And then send it to a Discussions Host. It doesn't hurt to put the URL to this discussion thread, so that whoever gets it has some context. Also give as much information about the context of the crash (in the email) as you can.
love, b

Crash when power supply is removed

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