Seems that if you do this you can get something quite cool up.
I WILL TAKE NO BLAME IF ANYTHING GOES WRONG AFTER YOU TRY THE FOLLOWING
First you must reset your iPod. Do this and read the next step while it is rebooting. To reset Hold the centre and MENU buttons at the same time for about 10 seconds.
Then when the apple logo appears, hold the centre and REWIND (LEFT) buttons at the same time.
After a few seconds your iPod will beep and a secret diagnostics (sort of testing) menu comes up.
To operate the menu up and down use the LEFT AND RIGHT buttons (clickwheel doesn't work).
To select an option press the CENTRE button.
The really cool one is PATTERN TEST.
TO GET BACK TO iPOD AFTER SELECT THE BOTTOM 'RESET' OPTION