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Mysterious Laptop Problem - Powers Off Suddenly / Doesn't Turn On


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#1 jerochan

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Posted 04 December 2010 - 01:43 AM

A couple of days ago, my laptop started powering off suddenly. One second it's on, and the next, no hard drive activity, no screen, no nothing. This happens in an instant and without warning (no blue screen). Starting yesterday, the problem got worse. After the power cut out, I would have trouble starting the computer up again. Sometimes it worked, sometimes it didn't. When it did work, I sometimes got as far as the Windows login screen. When I hit a key to begin typing my password (or swiped my finger on the fingerprint scanner), the power cut out. Today, it seems to have gotten even worse. Sometimes the startup process doesn't even get as far as the Windows login. A couple of times today, I pushed Power, got the the Windows Startup Error screen, selected to resume Windows as normal, and bam! Power's off.

Now, this gets even more mysterious. Sometimes I push the power button (after one of these instances), and nothing happens. Sometimes I push the power button, and the power light comes on, and then the fan, but no hard drive activity. Dead. Sometimes the computer won't start up at all unless I remove the battery, pull the plug, wait a few seconds, and then try again.

Even stranger... I have the computer on right now. It's been on for 5 hours, and it's working fine. I'm afraid to turn it off or put it to sleep, because I know it might not start up again.

If you are thinking overheating is the source of the problem, as of right now, after being on for 5 hours, each of my two processors is running at 53 deg. C and 45 deg. C, which I don't think is very hot.

I've been using computers for 25 years, and I've never seen anything like this. Any and all advice would be greatly appreciated. Thank you!

Specs:
Sony Vaio VGN-Z90US CTO: Core 2 Duo P9600 (2.8 GHz), 4 GB DDR2, 200 GB 7200 RPM HDD, 256 MB nVidia 9300M GS GPU, 13.1" 1600x900, Windows 7 Ultimate

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#2 Crazy49er

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Posted 04 December 2010 - 12:51 PM

Charge the laptop up to a fully battery and then unplug and run directly off of the battery and see how long it runs for.

Take the battery out, plug the laptop up directly and see how long it runs or if it turns on at all. (please take note of any jiggling or loose connections on the power plug or the area it plugs into the laptop.

The object of this is to find out if your 9 cell battery can hold a charge and for how long. And to test for any power failure in the adapter, the input, or in the laptop itself.


As for the problem itself, it sounds either electrical or heat related to me. 53 C sounds pretty hot to me, and from my understanding a laptop will shut itself down to protect the CPU from getting too hot.

#3 dc3

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Posted 04 December 2010 - 01:32 PM

Edit: Cnet has a review that stated that the maximum temperature was 95F, which would be 35C. This turns out to have been the maximum operating temperature for a HP EliteBook 6930p.

A staff member pointed out new information which shows the maximum temperature to be 105C, which is 221F. I did another search to confirm this and did find that this is the maximum operating temperature for the Core 2 Duo P9600. That is the hottest operating temperature that I've ever seen for a CPU.

Edited by dc3, 05 December 2010 - 11:44 AM.

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