I recently rebuilt my computer with refurbished parts from another pc that I had laying around, which so happenly have parts that were upgrades for me. Brought my computer to work so I can run updates and use the ridiculous bandwidth to reinstall all my games and such. I download Guild Wars 2 and it runs just perfectly on the best settings. I go to check up on customer computers at the same time, as I walk back to my back office, I see my computer quickly shut down. I was a little surprised but it wouldn't let me at all turn the computer on unless I waited for it to cool down. 5 minutes later it lets me boot up, and it runs just fine with no problems. I investigated what could have caused the sudden boot-down, I reran guild wars 2 and let it sit around while I was watching the temps. The computer was running at around 60-61 Degrees C. Naturally I turned the computer off and unmounted the CPU so I can apply a good layer of thermal paste to reduce some of the heating. I remount the heatsink/ fan and go to turn it on but now the computer isn't displaying anything and the razor keyboard and mouse don't light up/ respond at all. I replaced the PSU with a brand new one from my shop just to see if it might have been it because I knew it was starting to smell wicked. I really cant figure out what I could have done between applying the thermal paste and reassembling it that could cause the USB bus's to not work and the display in both my Gcard and Integrated Graphics. Oh, and yeah I already tried using a different monitor, 3 different ones around the computer shop actually.