I am haveing a issue with the motherboard powering on then shutting off instantly on a dell d600. Any one no if there is a way to check for a bad transsitor or maybe had same issue and was able to repair the motherboard?

Look at the motherboard for capacitors that are round on top. There are web sites that advertise they will replace capacitors (the names elude me currently) but it's expensive, and you're better off buying a new motherboard if that is the case.

try cleaning the ram sockets. i had this same problem with 2 different dell laptops

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