The problem i'm having with my computer is, when i plug the power lead in the back the computer turns on without me pushing the power button. Then once the power is on nothing happens, there is no display on the screen, my red hdd led is on at the front of my case. I've checked the hard drive in another computer and i'ts fine,i've also tried another graphics card in it and still doesn't display. I think it could be the motherboard. It was fine before i left for 2 weeks, then when i got back, it was like this. Please help.