msi 790fx gd70

amd phenom II x3

xfx radeon 4850 1 gb

thermaltake 850w powersupply

4 gb corsair ddr3 1333mhz

i just put togther my rig and it wont display anything and no noises. The fans spin up and the cd drive works but nothing lse. Here are the indications:

blinking leds on the graphics cards

on motherboard cpu phase led indicate 4 phase power mode

debug LED codes of FF D1 and D3

any idead?