The complaint and symptoms are classic cooling issues. Try this. Remove the case cover and try it again. If the issue vanishes or nearly vanishes be sure all fans are running, and nothing has a layer of lint or dust on it.
Windows XP Pro SP2 (media center 2004) Pentium 4 306 GHz 512 ram.
In the last month my PC has started to switch itself off in the middle of certain tasks. When it does my PC power switch will not work, and I have to switch the machine off at the power socket. I wait a couple of minutes, switch on at the power socket, and am reconnected without a problem. But the task in hand has of course aborted without any apparent evidence of it ever having taken place, any diagnostics, and no restart opportunity.
The problem was first experienced when my son, downloaded a version of Civilision 2. As soon as the problem occurred, I deleted the game. But the problem started to re-occur
Subsequent examples of tasks in hand when I experience this ''switch off'' are:
1) Halfway through ripping a CD
2) Running a full scan using Antivir - trying to trace whether this was a virus.
3) Running a full scan using Adaware - trying to trace whether this was malware.
4) Most recently - today - I downloaded a trial version of System Mechanic 6 - to see whether there may be a hardware or software malfunction. I successfully used it to analyse my hard disk - no problems detected and no switch off. I then decided to use the defrag tool, and the PC ''switched off'' 23% of the way through mapping my C drive.
Otherwise my system is running without problem but I am nervous and am at a loss to understand what the cause might be, whether software or hardware - how to diagnose it, and how to repair it.
Can anyone help - point me at a means of diagnosis without the risk of ''switch off'' - and any ideas on how to correct it.
all contributions gratefully received.