Hi, I have the following set up: Supermicro P6DBE Dual Processor Motherboard 2x P3/500's 228MB SDRAM @133MHz 12.1GB IDE Hard Drive Internal 56K PCI Modem ATI Rage 128 AGP Graphics Running Windows XP Pro. Yesterday, My PC reached a point where it would keep re-booting itself when I was in the middle of something (didn't matter what I was doing - so no specific application !). I was looking into it last night but got knowhere. When I came back to it this morning, I am no longer able to get the system to boot into normal mode. Safe mode is fine. When I try and boot either "Normal" or "Last known good configuration" I am getting so far, then getting the following blue screen: "An attempt was made to write to read only memory" blah blah blah..... Technical Info: "STOP: 0x000000BE (0x805FFFF0, 0x005FF121, 0xFBC96A78, 0x0000000A)" It advises to disable any BIOS features such as caching or shadowing, which I have since done and am still recieving the same error every time I boot up. I am a PC Technician by trade and have tried numerous things including: Run various diagnostic programs through the system which exhaustively test ALL hardware - Motherboard resources, BIOS, onboard cache's, Extended memory, CPU's, hard Disks, everything. Run various software diagnostics such as Norton System Works through it. Replaced all memory sticks even though no faults were reported by the above diag's. It was scanned for viruses only a couple of days ago. Defragged quite recently too. I have not installed, removed, etc any new hardware. I have not made any changes to the system's operation and not installed any new programs for ages. I've also had a browse through Google biut did not find any solutions suitable for me. Just wondering if anyone out there may have any ideas that I'd not already thought of ?? As I said, I'm a technician by trade so not affraid of any technical jargon you want to throw my way. Cheers everybody Simon

reformat the hd and start over, save your self a lot of time, trying to fix it.

Hi Mark, I appreciate your suggestion, but No way hosay !! There's far too much stuff on there. Data's not a problem I can hook the drive up to another system and save that. But it's taken me months to get this to the stage I'm at now. I'm not abou tto give it all up !!!! lol Cheers though. Simon