hardware diagnostic software

hi to all,

what program can you suggest for hardware diagnosis. i am having a problem with my PC, it restarts but on a undetermined time interval. sometimes after several days. i have checked the power source, no loose power cable connection.
one thing to note is sometimes when it restart, it doesnt switched-on immediately but you have to keep trying to push the power on, then after trying several times it is again alive.

nnbnbThe one that i have used a lot is PCCheck by EuroSoft. Its not free but it certainly is one of the better products on the market for doing Hardware Burn-in tests and diagnostics. There are a load out there though, hopefully others will have more to add to the list for you.

www.eurosoft-uk.com

You could try the Ultimate Boot CD . It's a collection of useful utilities which can perform motherboard, hard disk and memory diagnosis.