I got my laptop back today, it had to have a new battery, I am not pleased with the result.
When I switched it on the cursor kept jumping around and a cant get it to do what I want it to do. I left it on for a bit and the cursor just kept jumping around and so did the pages keep switching to and fro. sometimes the cursor flickers large then goes back to normal. I phoned the repair chaps up and I shall take it in tomorrow again for them to look at. They said it was ok when I came to pick it up, but they didn't switch it on in the shop for me to look at. So when I got home, I found it in the state I have mentioned. I hope they don't blame me for doing something to it.

What causes the computer cursor to jump around?

It's likely a setup issue Margaret. The computer has been completely powered down and has possibly lost/confused some of its default settings.

Hopefully, they will recognise the issue straight away and be able to reset it.

Thank you Rebbonk, I left if off for a while , now just switched it back on and it seems to be settling, but the cursor is still being slightly delayed when pointing to where I want to go. I shall have them look at it again tomorrow. it is likely as you you say, it has confused its settings.

The first thing I used to tell my staff when they had computer issues (unless it was data loss), "Shut it fully down, go for a cup of coffee and then restart it." Most times it would cure the problem. Some computers and operating systems were more troublesome than others.

All is well at present, my laptop seems to have settled back to normal now. Its working just fine.
I didn't need to take it back to the repair shop.

Sound advice Rebbonk. I use that same advice when the internet connection is ropey. Unplug it, go put the kettle on, make a cuppa, come back, plug it in again and distract myself doing something whilst it comes back to life.