I recently tried to upgrade my RAM from 1 gig to 2 gig purchased from Edge Tech. When I installed it and tried to reboot, the picture on the monitor was fuzzy and wavy---it stuck in the boot phase...starting over several times but never fully booting. I tried switching slots and got the computer to come on but it locked up soon after. When I removed the new RAM and reinstalled the old RAM it worked fine...any advice?