I do not have a solution other than maybe an exorcism 
Do you have a dual monitor setup ?
From previous post, you have already swapped out keyboard / mouse, so not much left.
You could try booting a different distro from a usb memory stick. From memory, knoppix comes with Gimp (and almost everything else)
Do you have a dual monitor setup ?
From previous post, you have already swapped out keyboard / mouse, so not much left.
You could try booting a different distro from a usb memory stick. From memory, knoppix comes with Gimp (and almost everything else)