The problem I’ve had for a week with my workstation at work was properly troubleshooted today. It turned out that it was exactly as I suggested from the very beginning. The problem was with CPU fan. And no, it was working. It’s just that the plastic lock that was keeping the fan glued to CPU broke for some strange reason. Now, I am waiting for the replacement, therefor my email response might be a little slower then usual. Stay with me.