Computer won't turn on.?

I'm no hardware guru, but here goes. I had an IBM laptop on which the Motherboard died - however, it still turned on but nothing else. Also when you purchased the new Motherboard, did you check its compatibility against your current BIOS set-up? Depending on the age of your Computer's BIOS and the newness of the Motherboard there could be an incompatibility problem. Word of Caution: if you upgrade your machine's BIOS, make sure everything else will work with new Motherboard.