|Changing the background picture probably has nothing to do with the mouse cursor freezing. |
If the mouse is corded,
- make sure it's plugged in all the way. PS/2 connected mice (and keyboards) are NOT hot pluggable - don't unplug or plug them in, or plug them in farther, when the computer is running - it probably won't work properly until after you reboot if it wasn't in the port all the way and you push it in, in any case.
- it's common for wires to get broken inside the cord, usually at or near where the cord enters the mouse, after it has been used a lot, or at any time if the cord was yanked on. If a wire's insulation is still intact for a broken wire such that the ends can still touch each other, the connection is flaky - wiggling the cord near the mouse, or re-positioning the cord there, MAY make your symptoms appear / disappear.
Try another mouse.
- you may have problems with a USB connected mouse if it's plugged into an external multiple port hub that plugs into one USB port, especially if there is an external hard or optical drive also plugged into the same hub.