Our standard procedure at work for client workstations reboots:
1. Remove the cover from the case. Check that all the fans are running, especially the cpu fan. If the CPU fan is doing anything other than running perfectly, shut off the computer until you replace it.
2. If nothing appears wrong, leave the cover off to see if it improves the interval between reboots. If so, you probably have an intermittant fan problem, or a heat sink that's coming loose from the CPU. Or dust/pet hair. If the inside is dusty, you may need to blow off with canned air.
3. If not heat, then check memory. Right click on My Computer and choose 'Properties'. Check again in 3 or 4 hours and again close to the time it normally resets. If you've have less, your memory is possibly going.
4. If you have more than one memory stick, then when it's just frozen, remove the upper half (the slots should be numbered) and check if the problem persists. Your computer will be extremely slow. After a while, shut down and trade the memory in the lower numbered slots. If no change, replace the memory.
5. At this point, it's probably a mother board or some loose wiring.
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Our standard procedure at work for client workstations reboots:
1. Remove the cover from the case. Check that all the fans are running, especially the cpu fan. If the CPU fan is doing anything other than running perfectly, shut off the computer until you replace it.
2. If nothing appears wrong, leave the cover off to see if it improves the interval between reboots. If so, you probably have an intermittant fan problem, or a heat sink that's coming loose from the CPU. Or dust/pet hair. If the inside is dusty, you may need to blow off with canned air.
3. If not heat, then check memory. Right click on My Computer and choose 'Properties'. Check again in 3 or 4 hours and again close to the time it normally resets. If you've have less, your memory is possibly going.
4. If you have more than one memory stick, then when it's just frozen, remove the upper half (the slots should be numbered) and check if the problem persists. Your computer will be extremely slow. After a while, shut down and trade the memory in the lower numbered slots. If no change, replace the memory.
5. At this point, it's probably a mother board or some loose wiring.