hi,
i have 2.4GHz P4 533MHz, D865GBF intel , RAM is DDR1 512MB x 2 ( 400MHz
kingston) operating at dual channel.

problem: my pc gets hanged or shutdown or restart while running any
program / games.

if it is hanged , keys and mouse gets locked,

but if it gets hanged while playing movie, picture / sound both come
fine but keys / mouse are locked, i have to push restart button.

but if it gets hanged while running game sound comes but picture stops
with keys and mouse locked.

some times it gets hanged at the time of startup i.e at blue screen
where intel P4 is written and some times stuck at windows XP booting
logo.

sometimes after hanging if i restart it gives the message at starup
that "previously computer was shutdown due to thermal overheating
service the processor and then start again."

surprisingly some times it works very good for hours and no problem
occurs and i do the shut down my self.

since the hanging is very un certain w.r.t time therefore the problem
is very complex,

i have changed the RAM with new 256MB 400MHz, i have checked the board
revesion number compatibility with the processor, format the hard disk
with fresh installation of OS., clean the processor heat sink change
the thermal grease. but no result.

any suggestions.