So recently i have decided to clean my pc and remove the dust building up inside. I removed the ram, gpu, hdd, and the heatsink to clean them. After i finished cleaning them, i put them back into the motherboard and try to open up my computer. After about 20 seconds at start up, the display would disappear away and nothing is displayed on the monitor. However i can see there is still power in the cpu because my mouse and headset is still working and the fans are spinning.