thanks to the both of you for replying,,so even if the computer has just
turned on and it still freezes and not given a chance to actually be on it
can over heat? i also think it might be ram has gone bad..the xp has been
installed over a yr now and has been workin fine till now...as mentioned
earlier i tried reinstalling the os but even while doing so it freezes so
the installation isn't even done..
If system had been off long enough to be cold (cooled off),
and it freezes within the first minute or two (amount of
time would depend on size of 'sink), it's probably not
overheating unless you had some rare accident or damage like
the CPU socket lug for the heatsink clip broke off so the
heatsink isn't on good anymore.
You need open the system and inspect it. At this age if you
hadn't yet, do the regular maintenance items- check fans are
spinning, lube and lower-quality sleeve bearing fans. Check
air passages including front intake through the bezel and
whether case holes are clogging up with dust.
Even if these things aren't the problem, they are still a
needed aspect of good long-term cooling. While in the
system inspect the capacitors on the motherboard too, they
might have failed and be swollen or have leaky residue on
tops or bottoms. If you had a multimeter, check PSU
voltages. If the system has a hardware/health monitor bios
page that shows voltages, temps, fan RPMs, check that too.
Run memtest86+ for several hours to check the memory but I
doubt the memory is the problem. Memory causes crashes of
apps and system might not even boot but a complete freeze is
less likely unless the memory had degraded severely
already... usually if it were that bad the system wouldn't
run long enough to do much of anything, not even execute the
bios and try to boot.
Playing the odds, it's most likely the motherboard or PSU if
the problem persists after you make sure it's not too dusty
and the fans work... but be sure to check all mechanical
connectors, cables, cards, etc to be sure they're connected
well. If the system had been moved around while the monitor
cable was plugged into video card, try removing and
re-seating the video card in it's slot.