problem with new system build

Your help please,
Here we are on xmas eve and I am the sad person posting questions about pc problems!
Today I took delivery parts to build my new pc, which consisted of the following.
Asus M4A785TD-V EVO mother board
AMD Phenom II X4 925 2.8GHz processor
OCZ 4GB (2x2GB) DDR3 1333MHz/PC3-10666 Platinum Ram
I installed all as should be but when I switched on my screen just keeps saying NO SIGNAL I have checked everything at least 10 times but still no signal to the screen I have even tried a different screen. Everything is as it should be, but obviously something is wrong but is it the mother board, cpu or the ram? As I am not getting any signal to the screen I assume it is the mother board (I am using the on board graphics via the vga)
I need to send something back to the supplier but which part is at fault? My feeling is the m/b, any views would be very welcome.
Oh and a merry xmas to all

If you have any pci graphics card you can installed to test if you get any video or hopefully your borrow one from a friend. Also how about trying with only one memory stick?.

yes if I had a pci card I would try but I don't I will try with one ram but because I am not even getting anything on screen my feelings are faulty mo/bo! it just my luck to get this on xmas eve! time to hit the bottle ma be?

All pc lights up, cpu and system fans running, even led on mo/bo lights up, I can hear the cd rom start up (which has my win 7 64 bit cd in it) but there is NO bleep like you normally get and screen is just black with no signal showing on it!

I have tried the ram in both blue slots and one in blue and other in black but no change, my screen is in the VGA slot.