mouse not working in full screen

[inseminate]

Okay so i have spent the last hour looking in the forums to see if anyone else had help with this problem but to no avail. Basically when I go into full screen mode (not the switchblade mode) I can use the mouse only I can"t see where it is. The cursor just sits in the bottom left quarter of the screen but I can still click on things if I manage to find it on the screen.

Thanks in advance for your help.