I built my PCabout 6 years ago, an z97 msi mpower motherboard and a i7 4770k CPU. I noticed that my CPU was running really hot, even in the bios, so I wanted to try to putting on a new coat of thermal paste to see if that was the issue. When I put everything back together, my PC is completely unresponsive. I've applied thermal paste before without an issue, and I've already checked my PSU and it works fine, using a different one did nothing as well. The LEDs for the power and OC button light up but no error code is displayed. I've removed my GPU and only have one stick of RAM. I'm not sure if it's my motherboard or CPU that's at fault.