I have a dell XPS M150 laptop. Recently the computer just stopped displaying anything. When I press power I could see the power light turn on. Then I could hear the fan blow and the CD player spin. Thats it. None of the usual gindng noises and I can not see anything on the screen. So I figured it was the motherboard. We installed new motherboard and I still have the same issue. I tried plugging in an external monitor as well. However I can not see anything on the machine. Any ideas?