kilo bravo

Thanks for all your responses. Will perform a check with memtest86 and check the other stuff like the fans, etc. I'm not really a computer whiz but I will see what i can do. by the way Zenskas the specs are 930 mhz, 512mb RAM, Intel Pentium 111 Processor, 9.30gb harddrive, desktop.

My Dell Optiplex GX150 keeps shutting down during boot up. Sometimes it runs ok, other times it runs for a few minutes and then shuts down and other times as soon during the booting process it shuts down then repeat the process over and over. I've cleaned the case and components of dust but still have the problem. Any help will be greatly appreciated. I am using XP Professional. Thanks kilo bravo