I have two out of 4 older PC's with no video I recently bought 4 second-hand Elonex Prosentia PC's circa 2002 with the following specs 250Mb memory m/b MSI MS-6558G chipset SIS650 video onboard SIS 315 integrated AGP Installed OS Windows 98se transferred from older PC's with no problems, then added a second video card Rage pro turbo PCI to allow twin-monitor support. All four worked fine, but for one reason or another, there was a need to re-open the cases of two of them and (for instance), change the boot order again, or swap one of the video cards due to occasional hardware errors. The odd thing is, afterwards, these two PCs no longer show video (on either of the video ports), nor beep, allthough all the usual lights show the PC is booting as normal. I have tried reseating memory, removing add-on video card, swapping memory, switching off for 24-hours etc, but nothing seems to work. There is no way into the bios when you have no video... Can anyone suggest a way of resetting the bios to defaults, to see if that brings video to life again?