one core constantly at 60% to 90%

bborch1

Honorable
Dec 7, 2013
3
0
10,510
an AMD Athlon II x2 with one core at 60 to 90 percent all the time with no visible applications running. What should I look for as a cause?
 

bborch1

Honorable
Dec 7, 2013
3
0
10,510
I didn't find anything running in the background but a restart brought the cpu back to normal. However, this computer is on all the time and at some point one core comes back to running at a high percentage with nothing on.
Now I discover that one of the core is showing a yellow exclamation point in device manager. I'll post that question separately.