It could be many things... but it sound like you could have possibly shorted something out...
did you get thermal compound anywhere you shouldn't have? depending on the type you use some are electrically conductive..
Since it's a video problem though I have to ask are you using the on-board graphics or a separate video card?
if you're using a separate video card then most likely when you reset the CMOS the mobo defaulted to boot from the on-board graphics first.. you'll have to hook the monitor to the onboard video connection of the motherboard and then enter bios to change the settings so the computer boots from external video card first
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