|Re #2. There appear to be a couple of things yet to confirm:|
Did you try each RAM stick in turn, one at a time in each position?
Are you saying you could not boot with a RAM Test disk?
If not were you able to get into BIOS to ensure the CD drive us set ahead if the HD?
If you never see anything at all on the display this is almost definitely a hardware issue.
Always pop back and let us know the outcome - thanks