Help On Window XP~

I had been using window xp for many year n last year nov my com start to had some problem...everytime when i on my com i nid to either wait for 10-20min n restart my com once to make my com working fine...
during the 1st to 20min my com either hang there or my screen black out n the moniter light change from yellow to orange...so i nid to keep restart my com den my monitor will *blink* one sound to c my screen...now is getting worse i nid to wait till 30min.during the 1st to 30min it keep hanging there n blacking out so nid to keep on pressing restart button until its working fine...can anybody help me to solve my problem...is my monitor,cpu or the cable from monitor to cpu problem?sumtime it will hang be4 going into my desktop.

The monitor is the easiest to check (try a different monitor) but also the least likely. The monitor is losing the signal from the computer.

This could be your graphics card or your power supply or also your RAM or CPU (but the last two less likely than the first two).

What is the make and model of the computer? Are you "into" opening it up and doing some testing? If so we can help with a few ideas; if not you should take it into a local shop or the place where you bought it if it is still under warranty.