Cursor jumping or sliding all over making the screen move up down left and down, making the lap top impossible to do with it
This was a common problem with certain MacBook Pros. I would highly recommend that you need to replace the keyboard/palm rest. These can be purchased via eBay. Make sure that you purchase the right one for your laptop as there are several different variations. The palmist has numbers on the back of it and also there is a sticker on the inside that gives the info about the computer. These will help you find the right unit you need. There are other options as well, first and foremost is to update your software, the next would be to reinstall all software, which of coarse means that you will loose everything and it takes forever to do. But my experience has been that the palmers/keybaord has gone bad.
If you're using an external mouse, make sure you have a single colour mouse pad as anything with different colours/lines on will cause the effect you're having.
You mention it's customised, could it be the customisation that's causing the problem.
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