This system started out with a bad PSU and Hard drive. When you plug the Hard drive into the power, it will not let the system start up. I replaced the PSU and Hard drive, The CPU fan comes on but there is no attempt to boot. I have removed all cards, memory, cables and still the CPU fan comes on and there are no beep codes or attempt to boot. Because the PSE and HD went out could that have also effected the Motherboard?