Quote Richie Royale:
That is the S900 though isn't it, which has fixed memory..
Yes, that's right. I misread OP's post. I thought he was talking about a 900. VJ, don't think they are the same though look similar.
OP, check the KW on startup. If it's 1536, you have max RAM. if it's less and you've got the expansion (will be separate board like VJ's picture), then try reseating the card is all I can suggest. If you're in there take some pics and post them up, it might help. I'm replacing displays on both of mine in April. So I can take pictures then
I'm All Ears.