well all I can say is make sure the RAM slot is clean and so it can make a good connection. I actually had a piece of hair laying across the RAM slot and when I sat it in there it somehow prevented the system from booting.
Other than that it'd be pretty difficult to 'fry' RAM just by taking it out unless you were playing football with it in a highly static charged area
If the RAM is infact dead then yeah of course replacing it would fix your problems but it seems ridiculous it'd stop working simply from pulling it out.
It's kind of hard to install it incorrectly because it can only really fit in one way. Still might as well pull it out, give it a nice blow with canned air if you got it and see if that works for whatever reason.