Jumpy Mouse Cursor

[TWO2SEVEN]

I recently got a used 2011 MBP. I noticed that after a little bit out usage the mouse cursor become a little erratic. I do not think that is the trackpad because it happens when I use the Magic Mouse as well. It seems to happen more on battery power than when plugged in.

Any ideas?

 

[TWO2SEVEN]

Anyone?

 

[ColdCase]

A flakey trackpad could affect any the operation of the external mouse/trackpad. The CPU is getting inputs from both.

Otherwise perhaps a process is hogging resources. What does activity monitor say?

 

[Barney63]

The battery isn't expanding beneath the trackpad is it.

Barney

 

[velvetlounger]

This just happened to me yesterday. I found that my power supply is the culprit.

My battery was completely drained. I plugged it in and started using the computer. I noticed that the mouse would jump around even if I just placed my finger on the touchpad. If I also touched the body of the computer the jumping would stop.

When I unplugged the power supply everything worked normal. It was then that I felt my powerbrick was too hot to touch. After the battery was charged and the powerbrick had cooled down the problem went away.

I bought my laptop refurbished from Gainsaver. Its possible they gave me a non Apple powerbrick or perhaps its just faulty.

 

[Barney63]

I think you can tell if it is a genuine PSU by watching the LED on the magsafe.
When you connect the magsafe it should be green for a second or so before going to amber (this is if the battery needs some charge). It is a safety feature of the magsafe so it doesn't supply power until it knows it is correctly connected.


Barney