OK, I have a problem.

I just installed my water cooling and finished leak test, I assembled the hardware back and turned on the PC, the mobo only detects 4 GB out of the 6GB, I remounted the CPU again, now it sees all the 6GB but the LCD poster is now displaying strange missing characters. I tried to reset the BIOS but no luck, I'm now going to try the new BIOS and see if I can fix this, any recommendations?