Current: When powering up my cpu, once the dvd drive activates(reads) the system reboots, and loops. This happens as soon as the memory check is complete, and the drive is checked by the system. This happens whether a disk is in the tray or not. If I disconnect the IDE cable, the system starts up fine, runs fine. If I open the tray before the cpu checks the drive(leaving it open) the system will boot up fine, but the minute that ray closes and the drive activates, reboot loop. Prior: My PSU failed(died) while burning a disk, I replaced the PSU, And one by one connected units(HD's Cards,ect) till I hooked up my dvd drive and found I had a problem. I swapped the dvd drive with another I had kicking around, and it does the same thing. Also tried a cd drive, same thing. Hooking up power is no problem, but once that ide cable is attached, things are a no go. I should mention my system has been static for some time now, nothing has changed, everything's clean, and current. It is not a software or driver problem since this occurs before windows even starts up.... most likely the Main board, or Bios. This is what I've got. AMD Sempron 2200 1.5 GHz 512 Ram, Main board SiS741 80GB HD IDE hook up, 120GB HD Sata hookup, Nvidia 6600 graphics card, sata PCI card, LG burner(not hooked up, plus a spare,same make) 450watt Power supply(same make as previous which worked for years) I've had the same setup for a few years now without any hardware problems. Also I should mention, CPU temp is fine, memory checks out okay,(the computer runs fine without a dvd drive hooked up, and no pin(master/slave) ever changed. IDE cables were changed, no effect. So, would I be right in assume my main board is toast? Is there a simple fix? I've played with the bios and found no joy there, 1st 2nd,3rd boots are HD's. I cann't figure out why a DVD read would reboot the system at power up. Maybe in windows, sure, anythings possible in the land of OS, but a start up? Ummm. Help.