I went away for all of last week and shut down my pc in the usual way and also switched of the power at the mains as well. On my return when I switched it back on, it starts up as soon as I turn the mains on at the wall socket. The power pack starts, the fans on the power pack, cpu and motherboard run, the keyboard and mouse light up, the dvd/cd drives light up but it does nothing else. No beep, no hard drives, no signal to the monitor, no response from the power button. I also can’t shut it down at all other than by the mains on off switch. I have removed every lead and plugin component from the motherboard, including the bios battery, and one by one reconnected each trying to power up each time but I just get the same thing. I seem to be getting power to the motherboard Gigabyte GA-81PE1000 with P4 3.0Ghz proccessor as the fans on the board run but I am now out of ideas.