Try reseting the BIOS, CMOS and see if it help, just make sure you change all the setting on your first boot. Look for any loose or not plug wires in the motherboard. What i would also do, is check that memory in another pc see if it's good.
This is imnportsnt advice. The CMOS stores the configuration. When you add memort, especially if it happens to be where the boot ROM loads itslef, if the CMOS is not in a state of grace, it won't load.
So short the CMOS pins, return the jumper to the correct position and when you boot, if there was no other problem, the CMOS will repopulate itself and it might work.
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Posting Virtuoso
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since Aug 2007