Hd 5450 no bios display

hello i have recently recieved my proccessor and motherboard back from the newegg RMA service and rebuilt my system. so far all has worked and all motherboard lights go on no problem but there is no display. i have tested with dvi and vga configurations on 2 monitors and have decided its the graphics card thats the problem. i dont think its a driver issue as before i sent the parts to newegg the system worked perfectly. help please!