Recheck everything... go step by step... check all connections through the power supply, then make sure the cpu is correctly insterted, the ram inserted in the right slots, the hard drive correctly installed and with the right connectors, the dvd and cd drives also with proper connections... and then the video... make sure the mobo's vid. card slot isn't damaged in any way... make sure the vid. card is properly insterted into the slot... and then make sure the lcd is in working order, along with the cables (dvi, vga, etc). If you've done all of this... and still issues... it could be an internal issue with the mobo....