About a month ago I reinstalled windows 7 (x64) on my laptop again. A couple weeks later, every so often when I wake my computer from sleep, the CPU starts working at 70%-95%. I tried waiting it out a couple times and the computer blue screens. It happens more frequently now (id say about every third or fourth time I wake it up). I've looked at the task manager and looked at all of the processes for all users (including system processes), but the sum of the cpu usage column (excluding idle) is like 10. Yet it says the total usage is really high and it takes >30 seconds for the mouse pointer to respond to my movements.
I am typically able to solve my own computer problems, but this one has me baffled because I don't even know what the culprit is. What can use the cpu, but not show up in task manager? Could it be related to something like bad graphics drivers or really hidden virus? My solution here is probably to just live with it until I get around to reinstalling the os again. I am hoping someone else can think of a better solution.
Update:
I had the process explorer running every time I put my computer to sleep. This morning when I woke my computer, I noticed that it was happening again. It took me about 5 minutes to actually take the screen shot because of how slow the computer was, but I did get one. Hopefully someone can dissect this for me.
Best Answer
Check the kernel times (figure 1) in the Performance Tab. Is the red line high?
Task Manager is limited. Use Process Explorer to get a better insight into exactly what is spinning the CPU.
From your description, it sounds like one of the drivers is having a problem. Hopefully all that is required to fix it is to update the driver. Another fairly easy solution would be to adjust certain BIOS settings depending on what is causing the problem.
Figure 1: Kernel Times