Last question. Somebody told me that "If software caused a crash, then it appears in the event logs" But i dont have any messages in event logs after that hard freeze. There is nothing about app crash. On windows event log i have this only: Log Name: System Source: Microsoft-Windows-Kernel-Power Event ID: 41 Level: Critical Description: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. So it can be something with hardware then? What you think?