Laptop touchpad not working when power plugged in
I have a Toshiba laptop that works fine when used on the battery.
Once the power supply is plugged in the mouse/touchpad refuses to cooperate, it moves randomly and shakes over the screen and is completely unusable. A USB mouse works fine both on battery and on power, it is just the touchpad that goes when the power is plugged in. If the power is unplugged the touchpad stops responding altogether.
The battery charges fine though I suspect the problem is caused by a faulty power supply
Not a school laptop just one of those friendly help me jobs so no other power supply to try.