I can click on the RESTART button in windows xp and it will log off save settings and then it starts to shutdown with the black screen, so it has started to restart. At that point it will not restart, I see the red led hard light has activity for a few seconds and then nothing. The power supply it STILL on but it will not restart . I have to push the restart button on front of the computer for it to restart. Then it will restart and reloads windows until the next TIME I click on restart and the same thing happens.  Could it be a power supply issue?? Or any thoughts.Has it always been this way? Some specifics on the equipment and the age would be helpful. Has anything changed lately? What else doesn't work right?Just noticed it the other day. Nothing much has changed. Its one I built. Soyo ultra kt333 board  512 memory. Everything else is working fine. Had a hp 1200 printer change to a cammon pixma mp450. It is a little strange, so I work on it a little to try and figure it out.No excursions inside the case for anything?I checked all connections to be sure all is pluged in good. I"m at a loss. I thought about power supply, because something I read about it having to release for a restart .  (The first STEP of POST is the testing of the Power Supply to ensure that it is turned on and that it releases its reset signal.)  Is that possible maybe?only way to fully CHECK what problem is try another power supply if it still does not reboot.or try a repair it may be a windows problemI GOT A NEW 450WAT POWER SUPPLY. That seems to have solved the problem. Thanks for the replys in this matter.