My pc was working fine until yesterday.(Intel celeron) Did not add any software or update any drivers. When i switch on the power button, only the red LED comes on, the green LED does not switch on as it used to and therefore the PC does not boot up. The monitor does not switch on. Shows nothing on the screen, not even a prompt. No beeps either. I suspected powersupply, tried a differnt working power supply, still only see the red LED. Do you think the motherboard could be dead? any insight would be appreciated.