Gday My husbands CMOS battery was on its way out, i.e. everytime it was booted up a "checksum" error popped up, no biggy I just reset the date and away it went. However as I had a dead mobo, with a working CMOS battery in it, I thought cool, I will just replace it. So I replaced the CMOS battery, it booted into the BIOS, and this is where I made a fatal error. I changed the time and date settings in the BIOS, der fred me forgot about all of the other settings :dead: Anyways, the computer rebooted, and I got nothing, not a startup beep, just a lovely black screen. So far i have :- 1. resat the CMOS Jumper 2. resat the video card 3. resat the ram 4. unplugged the PSU, turned the on off button half a dozen times. Tried rebooting holding down the insert key, STILL NOTHING!!! no beep just a black screen I am at a total loss as to why it will not boot up. Oh I removed the ram totally to see if it would beep, sadly nothing.