Dead chipset or mobo?
I've had the same system for a 2-3 years now with an ASUS A8N-E mobo and the nForce4 chipset.
The fan connected to the chipset wouldn't start when I was booting the pc, until I actually flicked it. I didn't know it was a well known issue with this mobo until it broke down!!!
I don't know if it's because the fan stopped working later on when I was using it, but I tried starting the pc and I got nothing. No beeps from the mobo and nothing on the screen (no BIOS), however all other fans are working and the led on the mobo is green and solid.
I've also had the problem where the pc wouldn't shut down when I press the power button, so I had to shut it down from the back of the power supply. It would start without me pressing the power button.
I have tried shutting off the pc, removing all of the unnecessary stuffs (Roms, HDs, ...), removing the mobo battery, moving the jumpers, replacing the jumpers and the battery, and restarting the pc. I still get no noise and nothing on the screen.
I don't know if that means I have fried the chipset and the mobo at the same time.
Thanks for any help you guys give me.