|"date/time reset"s usually indicate time to replace the CMOS battery... It's usually a flat shiny disk and clips into socket on the motherboard. Usually about the size of US/Canadian quarter, or a UK 10p piece (same size an an olde "shilling").|
Is this a homebuilt PC or a bought one? If the latter what make/model. If the former - what make/model is the motherboard?
That initial info will enable us here to be more specific with the cmos battery (location etc) and also other possible problems/solutions too.
Check the cooling fans - surprising how much dust that can accrue around the vents...
RAM - it "might" be giving you grief; but there are other things to try first...; before considering changing any;- although one can clean the edge contacts to good effect (see below).
A few utilities to run at some stage... will likely follow from pholks various here...
Meanwhile... Power down fully; remove power cord too - important to do that.
Locate RAM modules and carefully remove each. Clean their edge contacts with a soft pencil style eraser. Ensure no "bits of eraser left on the edges. re-insert each module and then remove and re-insert a second/third time. Then leave then in. Re-inserting a few times ensures that any oxide in the board sockets is also (hopefully) removed... The eraser routine cleans the oxide off the RAM modules.
Power up and see - apart from the date/time (CMOS battery problem) - if things improve? If you can secure a new battery first - prior to RAM cleaning - do so; better order of events.
Also whilst you have case open - carefully check the cooling fan on the CPU; ensure it does run...
message edited by trvlr