Gigabyte mobo over heating problem

[Ms. DICKINSON]

I have a Gigabyte GA-K8N with AMD Athlon 64bit that is over heating and auto shutdown when temperature reaches 68°C. I changed out the heatsink/fan and thermal paste but won't help. When I power it up, the temperature monitor in BIOS shows steady climb and shutdown, ~3mins. There's not much heat coming from the heatsink. Any idea or just a faulty mobo? THanks.

 

[killster1]

sounds like bad heatsink, so you say that both heatsinks you tried are not working? is it bolt threw or is it with the 939 retention clip? when you put paste on the cpu and then put heatsink on and pick up the heatsink and make sure the paste transfers on the heatsink from the cpu and that it spread all the way across, also is it the mobo overheating or the cpu?

 

[Ms. DICKINSON]

It's a retention clip. I've tried multiple times, the paste was spread evenly when clipped on. I don't know what is faulty (I would assume the mobo). We used it for years and suddenly just shuts down. CPU fan is running steady at 3200 RPM and the temperature on the BIOS shows it shooting up. The heatsink is warm to the touch (little above room temp) but not hot.