Hey guys, so I posted on here about 14 months back concerning a new rig I had just purchased from Cyberpower and the issues I was having with it and you guys were incredibly helpful then, so I figured I'd get some advice on this situation. So about two weeks ago I noticed my computer having some serious heat regulation issues, with the CPU shooting up from 33C to 64C just from sitting on the Desktop; I also noticed that my CPU fan wasn't changing speeds as it got hotter, even after I manually told it to in the BIOS; it also was giving a reading that made no sense for a CPU fan (4500 RPM), so I thought the CPU water cooling system may have finally gone. So i ended up getting a brand new aftermarket heat sink and cooling system (it's huge) and a new gaming case since i needed the extra room; did a swap of all of the materials,rebuilding the rig and installing the new fan and system. Right after, things went pretty good, was running games with no issues and the CPU wasn't even able to be pushed beyond 43 C (which was awesome). Then, all of a sudden it locks up mid game; no BSOD, no motherboard beeps, nothing. Turned it off and restarted, and then it ran fine for a while. Next day, the issue happened again, and again, and again, these times it happened when running different utilities; it seemed if I kept on the main screen and didn't run anything, nothing happened. So, i've been looking at the RAM (and am running memtest as we speak) and checked other issues with the cords, power supply, etc. It seems the PSU is fine and it may be that i have hte ram mispaired (in order to have the cooler fit I had to remove a ram chip, leaving me with 3 2GB chips (1600 DDR3), so i thougth the one chip was maybe having pressure on it, so i removed it to leave me with 2 and the issue presented, so i'm wondering if I have them mispaired or something. Now I plan on installing new RAM anyways (I want to get back up to 8GB so i ordered two 4GB chips of the same type) but my friend is going to be buying the chips, hence the memtest. Beyond the memtest, what other tests/diagnostics can I run to make sure it isn't something else causing the issue? Tests for the PSU, mobo, etc. would be useful. My next step after the memtest will be to check if one of the PCI items is causing the issue. The reason i'm a bit confused: everything worked fine before the swap, now it's having issues. Now I realize something could have happened between that, but I was careful and have worked on computers before, so i know the routines of what not to touch, how to ground, etc. That all being said, there is one thing worrying me: in swapping out the coolant systems, the old liquid cooling system had the back bracket GLUED to the back of the mobo (don't even get me started...). In order to attach the new heat sink/fan, I had to pry it off; i was as careful as possible, but I realize some damage may have been done to the mobo, but from what i've read and know, I would think mobo damage woudl cause issues with booting. It boots without issue, so i'm not thinking it's that. Any suggestions/direction pointing would be much appreciated. Thanks guys!