I just received my 1GB stick and put it in slot 4, however on restart the system only shows 2GB! (When it should show 4), saying slots 2 and 3 are empty. So I removed all the sticks and put this new one in slot 1... it doesn't boot up! Faulty memory or do I need to do anything to get it to work? It's a kingston MP1066/1G, purchased from ebuyer... but what I did noticed was that the seal had already been broken (!!) so possibly one someone else sent back!! Argh!