I installed a brand new NZXT x42 water cooler for my brother-in-law last night, and now we can't get it to boot up. I used my anti-static gear so I highly doubt anything is shorted out. This is the computer in question: <link>. All I did was take out the stock fan and heatsink, clean off the old thermal compound, put new thermal compound on (I used the good stuff, Arctic Silver 5), and install the new pump and fan/radiator combo. I didn't unplug the 4-pin connector that powers the CPU because it wasn't necessary, so that can't be why it's not starting up, although that's how it's acting. I thought that I might have bumped the RAM while installing the new cooler, so I reseated it. The radiator fan is connected to the CPU_FAN header on the motherboard, so that shouldn't cause it to not boot up. The only thing I can think that would cause the computer to not boot up is maybe the power supply can't handle it? Maybe someone on the forum who is more knowledgeable than I am can help me out here because I've been wracking my brain trying to figure out what's keeping it from POSTing.