Question : XPS M1530 not booting

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?

Answer : XPS M1530 not booting

Is it the same cpu or a new one?  Power up, fan, cd spin... next it line would be BIOS looking for a drive so this indicates a bad cpu or bad RAM