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Tech Helproom

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Random Reboots?


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My old pc has been working fine, until recently when it's started randomly rebooting itself. When it tries to reboot itself it fails 3 or 4 times then succeeds and starts up completely normally.

I didn't think much of it at first since I don't use it that much. I have since dual booted it with Ubuntu. Same problem occurs so it's got to be a hardware issue right?

Could be old graphics card (7800GTX) so I installed it with an older driver (before the problem started) and it still reboots. Didn't even install a driver for Ubuntu.

Doesn't seem to be a heat issue as it never seems to be running that hot CPU/GPU ~40-50 degrees idle, GPU max out at 78 degrees under game load, CPU never goes above 70. I opened up the case a pointed a room fan inside to keep it cooler, still reboots!

Now I'm thinking PSU? Not sure what to do at this point....

Specs: PSU: 500W SilverStone Strider (ST50F) CPU: Intel Core 2 Duo 3.0GHz E8400 RAM: 2GB HDD: 1TB Samsung F1 Spinpoint + 160GB Maxtor (Ubuntu on second drive) OSs: Windows 7 32bit / Ubuntu 11.10 32bit GPU: Nvidia GeForce 7800GTX - Dual screen DVI-D(1440x900 + 1024x768)

Any help would be much appreciated!

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Fruit Bat /\0/\

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Now I'm thinking PSU? your probably right as you have eliminated software by using a different op system.

If renewing a PSU check:

  1. The physical size of your PSU, some are hard to replace due to being a non standard size.

  2. The amount of power need from the PSU don't skimp.

  3. The correct connections for your equipment

1. Physical Dimensions

Besides the specs and form factors, the physical dimensions are also important factors in selecting a compatible power supply. Here is an outline of the physical dimensions of most standard power supplies:

ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws.

Mini-ATX: 5x3.5x5", HxWxD. Rare size. Uses 4 mounting screws. Can be used in a regular ATX case, but often not the other way around.

MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX.

Flex ATX: Even smaller than Micro ATX. Various sizes according to case specs; often not interchangeable.

Use the data above to determine if a particular power supply would fit your case.

The quality of a power supply can be estimated by its weight. While this is not a true scientific or thorough measurement of the power supply reliability, it is nevertheless a very simple and easy way for ordinary PC users to estimate and compare the quality of a power supply. Why weight matters http://www.directron.com/psu.html

2. Power supply calculator http://www.antec.outervision.com/

3. Correct connections Some boards have 20 pin connectors others 24 pin There is often a 4 pin plug required to power Intel CPUs Molex D plugs for IDE HDD and CD/DVD drives SATA power connections for latest HDDs and DVD drives.

Guide to changing PSU http://www.videojug.com/film/how-to-install-or-change-my-computers-power-supply


HP and compaq PSU problems guide http://h10010.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&product=3739786&docname=bph06788

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Cheers dude, looks like I'm going shopping!

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