ASUS M2N32-SLI Deluxe Wireless Edition HELP

Hi, i bought a ASUS M2N32-SLI Deluxe Wireless Edition motherboard, it was sold to me off ebay as used, but in still working order.

I have installed
a 500GB Seagate HDD
Nvida GT520 1GB
Evo Labs 400 Watt PSU
an LG Blue Ray Disk Reader
& 2 2GB RAM, i had these from my old pc - http://www.memory4less.com/m4l_itemdetail.aspx?itemid=1...

They ive read around & it seems they are not compatible even though they have the right specs?

When i boot, all lights come on, HDD appears to be on, DVD Drive appears to be on, GPU appears to be on, so does the CPU, But no output on Monitor? ive tried everything, refitted everything properly. I have some value case, it does not have a HDD LED or similar.

The green light appears to be on, on the motherboard aswell.
I took the RAM out & the pc & everything was still the same, changed the slots too.

Is it the RAM?