Hi. As I said, I swapped the motherboard over, so I have reconnected every cable. Also I've tried different graphics card. And new MB is with onboard graphics, so I removed AGP one). HDD is working inside other PC, so HDD cant be a problem. Actually, I should get some picture from BIOS, but no, because PC wont go to the Bios. And there is nothing to do with Windows and drivers, because even BIOS wont load up. I dont think that CPU can cause this problem, because MB without CPU should get to BIOS, am I right? Same thing with RAM. If RAM is faulty, BIOS will tell you that your RAM is faulty. But there is saomething else. Also it cant be a power failure, because CPU fan is working, that means power is going to the MB.