RAM Slot Faulty? Computer Only Boots With One Module of RAM

Ok, so my Macbook Pro is out of warranty and my 100gb HDD was getting a bit tiny, so I decided to upgrade it myself.
After following directions on iFixit, the harddrive went in without a hitch. When I put it back together and boot it up, the latch/sleep light came on, hdd spun up, fans spun, CD spun however the screen refused to turn on.
So I tried resetting PMU, PRAM etc to no avail (would not accept keystrokes). Then I had a fiddle with the RAM (there is 2 512mb modules) and basically worked out that if I have either one module in the top and nothing in the bottom everything was A-OK. But if I put either one by itself in the bottom or have both together (either way around) the computer would do the same thing as before (screen would not turn on but made all other usual sounds). Does this mean the bottom RAM slot is faulty?? If so would the logic board have to then be replaced?!

Welcome to Apple Discussions!
That's exactly what it sounds like that the RAM slot is bad. Unfortunately you also might have damaged it yourself in doing all the iFixit instructions. And yes a logicboard replacement would be in order if you couldn't get anything to work. As long as you have something limping along I'd save the money for the logicboard replacement, and in the future have an authorized service center do such installation while you are still under AppleCare with the proviso they promise you to document it under AppleCare that they did it and they will remove the RAM if it ever was found to be bad in the future so that you have no risk of losing your AppleCare in case an accident happened in the installation. If no authorized service center in your area will give you that sort of stipulation in writing, be sure only to buy machines build to order with the parts you need up front, and don't expect to be able to upgrade it in the future.

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