sometimes if you re-seat the video card it can fix a no video error like that, but it sounds like you have a bad video card or ram. also, most boards are dual channel these days so you can't run it off just one, you need 2 on the same channel. most boards that require this have 2 different colors per channel, but they alternate so the one closest to the chip, and the one 2 over from that are the same channel, as are the one second from the CPU and the one on the end.
the BEST way to find out the problem is via the PC speaker which it sounds like you don't have installed. remember that little black cylinder with a short wire coming out of it that came with your case? plug that in on the bottom right of your board where the power/reset/HDD LED wires from your case go into the board.
then you just go by this:
1 short beep Normal POST - system is ok
2 short beeps POST Error - error code shown on screen
No beep Power supply or system board problem
Continuous beep Power supply, system board, or keyboard problem
Repeating short beeps Power supply or system board problem
1 long, 1 short beep System board problem
1 long, 2 short beeps Display adapter problem (MDA, CGA)
1 long, 3 short beeps Enhanced Graphics Adapter (EGA)
3 long beeps 3270 keyboard card
my guess tho is that it is the video card. check the power connectors if it has any and if not, see if you can borrow a different one from a friend if you don't have an alternate one to try.
Good Luck!