G'day. Dismantled PC (removed peripherals and power) for about a month due to house renovations. :cry Re-mantled it (?) and it won't boot. :cry Power LED and HDD LED on front come on, but no POST beep, and no signal to monitor. No LED on motherboard lighting up. Pretty sure it has one. Power supply and CPU fans run ok. Removed the following: two graphics cards (running two monitors, and onboard graphics is shot - I've run it like this for more than a year), HDD, RAM, DVD reader, floppy reader, all USB items, monitor, mouse, keyboard. No beeps at any stage. Removed CMOS battery and tested voltage - very low. Tried a new battery and no change - no beeps. :cry Left battery out for about half an hour then replaced it - no change. Removed battery and for about 20 seconds shifted a jumper which I think is the one that resets the CMOS (no label). Replaced jumper, and still no change. Any ideas? :confused I'm thinking that the motherboard my have died, but I can't see why dismantling the PC for a month would do that. What if the CMOS battery was too flat (lacking power) to keep things going. Would that cause this behaviour? Maybe I should put one of the graphics cards back in. I have one AGP and one PCI. BIOS was set to run the PCI first, I think. It wouldn't work the other way. The MB is Sapphire Axion RS300 (pretty old). MB chipset is ATI Radeon 9100 IGP. Merci d'avance.