Can anyone help me? I am using Mac 10.4.11 and a couple nights ago my grandson (2 years old) was pounding on my key board pressing many different keys. This has totally changed the appearance on my screen. Every thing is in weird colors almost like you would see a negative of a photo gragh exept there are some colors. I've tried going into system preferences to appearances and desk top and screen saver but I have not found the right information. Thanks for any help.