Im not too sure about issues relivant to memory and Ram specifics. I will state 2 obvious questions.
1.Does the Ram upgrade your installing match the motherboards specifications for Ram speed and data capability? (ex: Pc 3200 400MHz, Pc 4200 533MHz)
-Its possible this can conflict somhow, resulting in system errors...or other things??
2.Can you access the bios settings? Is the probelem with the Operating System or hardware?
Give the error message and keep us updated