I've just added a stick of RAM to a Compaq Evo SFF D500. Amazingly easy to flip up the easy access tray to fit the stick. However, the tray (which houses the CD Rom) has locked in the 'up' position and I can't get it to go down. I'm sure there is a release catch somewhere, but I can't find it. Maybe I just need to push it a bit harder. but i don't want to break it. Any ideas?