Well, mine was running perfectly until I put in the additional RAM and then it just died completely - it doesn't even beep. I tried every trick in the book but it's just dead. I really hope it's just the motherboard. I'm hoping I will be able to get a new board through warranty but these things can take weeks.

I ordered a thingy to connect internal HDDs through USB, which should arrive today, so that I can try out the HDDs on my laptop and find out if all the data is intact, which is the most important thing.