Thanks everyone for your help.. very much appreciated. Ironically I got my 500 to work using these techniques LOL I'd still like to get my 2000 working. But that will have to wait a while. At least the offending battery has been removed!
Again Thanks!
If there's any leakage from the battery onto the motherboard/pins etc then you need to neutralise it with lemon juice...or it will continue to do damage (wouldn't hurt to treat the area just to be safe).
