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Computer restarting itself on boot up and proceeding to work fine

Hi, I have put together a new build computer and it seems to be running fine however when I turn it on, after about 5 seconds it turns itself off and then straight back on again proceeding to work fine from then on. I'm pretty sure this is not standard behaviour and wonder if anyone has some suggestions as to what could be wrong. The CPU temperature is a nice 34 C or so whist running
2 Solutions
i would check first the power you need, your PS can be marginal :  http://extreme.outervision.com/psucalculator.jsp      
It could well be a power issue as nobus has already said, the PSU is under its biggest strain at startup when all the systems need to be initialised and all the drives spun up. It could be that the PSU cannot meet this peek demand.
Try Right Click my computer > Properties > under startup and recovery area > Click "Setting" > untick the "Automatically Restart" under System failure area.

See whether got any blue screen showing out ...... If got, post the information in here .......
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km176351Author Commented:
Thanks for your comments, I actually have a 500 W power supply and according to the power supply calculator, I only need about 278W so it should be plenty?
you included all devices? - it can still be a power problem; try disconnecting all devices noty needed for booting, like cd drives, pci cards etc .. for testing
Whats in the events in control panel administrative tools event viewer?
Rebooting can also be video card problems audio problems. Virus.
 any hardware conflicts in Device Manager?
here is a simple drill down for you
Windows restarts without warning.

Can I ask, Is the machine getting as far as starting to load Windows in the 5 seconds or so before it reboots?? If not, then you can rule out Windows as a likely cause of your problem.

Have you tried disconnecting the power to your hard disk and seeing if it still happens. If whilst disconnected it still reboots after 5 seconds, then it's definatly a hardware or BIOS problem.
If it dosn't reboot, then it's likely a Windows problem.

If you have another good known power supply I work also try swapping it, just to rule it out, (even if it's only a 250W or 300W, that will be fine for testing purpose).

Or you could try resetting your CMOS/BIOS, say to 'default settings' or whatever similar choice you have, that may be a possibility?

Good Luck!
km176351Author Commented:
Thankyou all again for your comments. It is actually resetting 5 seconds after pressing the computers On switch so like you say, don't see how it can be anything to do with Windows.
If it is any help in diagnosing the problem, I have noticed that it only seems to occur when I have turned the power off at the wall after using it.

I will try and get hold of a different power supply today and see what happens!
km176351Author Commented:
Yes, it was indeed a power supply problem. One of the connectors I was using is broken or has faulty wiring. By using a different connector, it seems to be working fine now. Thankyou all for your help

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