PC restart itself?!

[sarahmafia]

I can use my pc upto 30mints or ever worst ll b only for 5 mints.. then its ll start to restart again.. but the problem is, once restart, its not goin to login window.. its keep on restarting te system ... at end i need to switch it off the system.

i do even try 2 change with ram, its not helping?

so do anyone know.. wats wrong wid my pc?

tx in advance ;P

[dcc]

Does the computer come on and stay on after being turned off for a while?

This could be a over heating issue, have you clean out the inside of the case recently?

[sarahmafia]

The casing is clean.

Once i shut down the system, when i turned it on.. its just the same, it doesnt show the login windows.. and its keep on restart again...

The system will run if i tried it after few hours.. but then it will restart again

tx for replying ;P