[poopers]

It should be fine, switching off at the wall can’t harm them, only mess up any non-saved files.

By fan you mean psu fan not cpu fan? First thing I’d do is check the RAM is seated properly; it’s quite common for it to slightly come out of the sockets with all the temp cycles they go through, had happen to me a few times with different machines. Check for any beeps from the mobo to help diagnose the problem too.