Curser problem

[CloudWatcher]

7. Something else to try ...

Ah, well it is looking more like a hardware problem (failing trackpad or bad cable to it).

But since it's a pain for you to go to the Apple store, try two more things first:

1) reset parameter ram (hold down cmd-opt-p-r during boot until you hear it reboot)
2) reset the SMC. Directions written up all over the web, one copy: How to reset PRAM and SMC

Odds are not great that either of these will fix it, but they're easy to do and if either the SMC or the Parameter Ram are corrupt, it can cause all sorts of odd problems.