No Video signal abruptly occurring

I've read the forums but my issue seems selective and could be multiple problems. I could use some feedback.
System build:

Asus Striker extreme mobo
intel e6600 core 2 conroe cpu with danger den water cooling block
OCZ x2 2gig blade pc2 9200 ddr2 dimms (newly installed from corsair dominator pc8500 dimms x2)
silverstone strider 1000w psu
x2 evga 8800 gtx in SLI with x2 danger den specific water blocks
danger den black ice extreme 3 radiator
samsung LED tv 46inch being used as monitor. running 1920 x 1080p

System was working fine since i bought it but i wanted to try water cooling as i've never done it and wanted to get into some OC'ing and also haven't done it before. installed the water blocks on the vid cards and the cpu only. everything was working fine for months. More recently i'd been seeing RAM issues which i didn't know until I ran a non-quick boot and system showed solid issues with the corsair ram. bought the new ram as stated and messed with overclockin and the like to try and get the ram to its stated 1150mhz speed. When wasn't agreeing with me stopped and reset to defaults. As system progressively got worse i eventually began getting the no video signal while in the middle of just about any function. Saw this at first playing games, then it would happen while just on my desktop or surfin the web, then as computer was left in use more and more this would just display upon boot up. Recently went on a trip for 5 days and left my computer off the whole time. Came back and used just one video card instead of 2. booted up and system went to windows without error. After a few hours of tinkering with some reinstalls system shot right back to no video signal. Now when attempting to boot it'll go right to no signal or if i'm lucky to see the boot up or get to bios it is starting to look corrupted or give me an entire color on screen. I've tried cable in other ports both on comp and monitor. I've swapped memory for brand new, tried 2 / 1 gpu with same results, PSU seems fine at 1000w but not sure how to tell. The system seems to boot fine after prolonged off time but once i boot up without error it eventually goes into it's progressively conking out mode. connections are all good and rechecked. thought maybe was overheat issue but dunno. Please bear with me as I'm learning much of this as i do it. Excited with the challenge but frustrated when issues arise that i can't seem to troubleshoot.