try resetting cmos if it don't boot. here is one way to see if it's going to work again. 1)remove battery and short battery terminals together for over two minutes. 2) use a old vga video card and have only cpu and fan ,ram and hdd,cdrom,hdd. in the system this will let you see if your BIOS got messed-up and you my be able to fix it. You will be useing the boot block part of the BIOS witch will still be in tac so you could flash the system then. good luck .k8vol.