I am diagnosing a computer for a friend, and they put in a liquid cpu cooler about 1 month ago. and it starting occasionally not turning on, so they replaced the power supply. I have tested the new power supply, and the case cables for the switch, both are good. Yet still no boot. However I noticed that a case fan was plugged into the cpu fan and the liquid cpu cooler was plugged into a case fan port, with the coolers fan plugged into yet another case fan port instead of the cooler. Specs: MSI ZH77A-G43 MB, EVGA 850 BQ PS, 2 seagate 1tb hdd, 1 SP SSD not sure what size. 8Gx2 Gskill DDR3-1866 & 4Gx2 Gskill DDR3-1600 for RAM. Don't want to take off the cooler to see what processor it has.