Yes, talking about the old PC, I tried to instal Celestia on it, cause my macbook heats up too much, but I think I've become PC iLiterate. While trying to instal Celestia, the install did not complete (probably because of only 256RAM) and I restarted, never to be able to start it up again. Makes some beeps but have really no idea what to do. How lucky I switched to mac! From a happy mac user!