My computer keeps rebooting after the windows logo

by sponcejr - 1/20/10 11:53 AM

My Dell Optiplex GX520 keeps rebooting after the windows logo. It goes on to start up the network and then it just restarts. It does not go on to the log in screen. I ran the Dell diagnostic and it passed. Now what else should I look for. I tried on safe mode but no luck.