My pc is not starting up. When I press the start switch, the power led just switches on for a second, the fan over the cpu rotates for a second, and then everything goes dead. After that, pressing the start switch produces no reaction, until I unplug the power cord from the socket and plug it back in. I have tried installing a new bios battery, and also removed & reinserted ram.I'm assuming this is either a power supply or motherboard problem. But, my iPod touch is getting charged via the usb slot in the pc. So I'm confused...Could anyone confirm/advise what the problem could be? Thanks in advance.