When the machine is activated via the on/off button it takes a while to load. Then after I have selected the user to log in as usually the loading stops very soon after. It then automatically and abruptly reboots. It then either shows me the menu to select a mode to start in or it simply proceeds to normally go into Windows after which the same occurrence takes place again and again.

I also heard suspicious sounds from the machine. First the constant middle sound which appears normal, then suddenly this stops as a higher sound dominates which is occasionally a bit choppy in nature.

But now I have noticed the screen stayed black for a reasonably long time as the machine started and it made strange hacking or choppy sounds. While this occurred, the reset button did not function nor did the on/off button. Then it abruptly rebooted after which the menu to select an operating mode was displayed. (I am now typing this message in Safe Mode with Networking.)

I vaguely recall a message saying it might be due to changed hardware or software. Hardware has not been changed (unless it is internally changed/malfunctioning without my knowledge) and the only software changes were the deinstallations of Ground Control and its part 2 multiplayer demo which both did not reside long on the disk (it was very very short).

I have scanned the disk with anti-spyware (Spybot Search & Destroy) and AVG anti-virus: Spybot showed few findings and the anti-virus showed no detections of viruses.

I require good advice to uphold this apparatus. What are your recommendations?