| Do you see any video when you first start the computer? A message stating "no signal"?|
Do you have mounting standoffs under every mounting screw and ONLY under mounting screws?
Did you connect both the connectors listed below?
1 x ATX 24-pin power connector
1 x ATX 8-pin 12V CPU power connector
Did you connect the CPU fan to the header marked CPU fan?
Did you connect the auxiliary power connector to the graphics card?
Do you hear any beep codes when you start up?
Clear the CMOS by using the jumper while the computer is unplugged.