Why does the system unit of the main server PC turn off?

Question

Iron

after a sharp shutdown of the PC, it automatically turns on itself, drew attention to the overheating indicator, it was on, after loading Windows Server 2008R, it writes an error in the event log "error code -41, Kernel-Power. And writes such a message" The system rebooted, did not having completed the work. This error may be the result of the system becoming unresponsive. A critical failure has occurred, or the power has suddenly turned off. "Help me figure out if it's a PSU or a UPS, the computer was cleaned a day ago .... there is no dust, the temperature in the room is 24C.

Answer 1

The temperature in the room is not an indicator. At 24 in the room, the processor can have all 70.
You need to remove the covers and see if all the fans are working. If the server has cooling diagnostics, watch it. Well, or put speedfan.
The UPS has never seen such "drops". They usually either work or they don't.

Answer 2

What is the processor temperature? after cleaning cooler normally attached? how long does it take to reboot?

Answer 3

Well, it’s logical that if they cleaned it a day ago and after that it fell, the problem is cleaning