Green flashing light at the back where the power supply unit is. Disconnected the cable to the motherboard as suggested in forums and now no green flashing light. Do you think it is the motherboard? PC was working fine before - no hint of an impending problem. Anything I can try before I get the motherboard replaced?
Also, I know it's a HP pavillion about 5 years old but can't find the model number on the PC!