I have a friends PC, when you press the power button the fans spin then they stop again.
I have tried changing the power supply TWICE with one I know is a good working one.
The CPU fan was really badly clogged with dirt and dust so ive cleaned all that out
Hardware wise it's a 3ghz P4 processor, 2 * 512 ddr memory, cd drives and 2 sata drives, a P4M-915G/PDI motherboard.
I have also taken out all PCI cards, graphics card, unplugged the hard drives, re seated the memory, cleaned the CPU etc.
If I actually hold the power button in the pc fans stay on but ive only held it in for 3-5 seconds as I dont want to damage anything else. So it could be the power button or maybe the motherboard??
The problem is there is no reset button so I cant rewire the power on switch to effectively power up the PC using the reset switch unless I swap everything over to another case.
Does anyone have any suggestions before I start completely rebuilding and swapped casec etc??