I used to know a guy who stored his 3000 for 6 months at a time while living at his winter place in Florida. A couple time when he came back, the system would die as soon as he turned it on. He finally found out that the diode charging the RTC battery was blown. We figured the battery went completely flat in storage, and the recharge current was too much and blew the diode. You might look at that area... I don't have my 3000 schematics handy to point you to the right diode.
