Hi, I have Dell XPS 8900, I changed the mobo recently, and power supply. Now my computer wont boot. When I connect the computer it blink the power button. 2 times, pause, 7 times, and repeat.. 2,7,2,7 (Just orange light) Anyone can help me? Sorry for my english, thanks for any help.
2,7 are memory failure. Remove and replace the Dell memory in the memory sockets and retest.