PRAM battery is pulled, as in you don't have one? That would account for a lot of random weirdness. You NEED a good battery in a Cube. Random shut-offs and turn-ons are likely related to the proximity sensor on-off switch. Much discussion on forum at cubeowner.com, but generally cleaning & flipping over the gasket around the button will make it behave. Other problems could be bad RAM, but that's more often crashes while launching programs or booting. The Airport card sounds suspect, or perhaps the socket for it has a bent pin. Other wise, make sure all cables and cards are firmly seated, etc. Normal systematic troubleshooting will track down the culprit. Make one change at a time, so you know what each change does. Cubeowner forums are a good source of help. A search will turn up info on most any problem.