help please my hp computer turns off

[steve42]

i have a hp computer that is 14 months old from new
i installed windows vista ultimate on it but then it kept on shutting down
but the power light stayed on flashing then i have to take out mains lead as it would'nt shutdown completely by pressing the power button (nothing would work)

ive tryed putting windows xp back on but every time i get through the remaster it shuts down again as i exsplained above

help would be great

cheers
steve42

[JimS]

I have a similar problem, although I don't think the power light flashes. After a failure, pressing the soft power-on switch turns the fan on, but the computer does not boot. I have to turn the switch on the power supply off and back on, and then it works fine.

Mean time to failure is about 24 hours, but it varies greatly. Most (but not all failures) occur when the computer is not in use -- at night or when I am gone.

I have replaced the power supply, CPU fan, motherboard and processor. The RAM tests OK, and the drivers are up to date, according to Vista. A monitor shows the temperature is well below the limit, but once or twice a day, the monitor reports an over voltage of slightly greater than 10% on the +5v reading. This is true with either power supply.

[JimS]

Also, for lots of ideas (some contradictory), try this:

http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1282723&SiteID=17

Many people seem to think it's a Vista problem.

[bat]

Check your hardware & software compatibility
http://www.microsoft.com/windows/products/windowsvista/buyorupgrade/upgradeadvisor.mspx

may your system dosn't compatible with vista.