Can't get back to Main window

I have this problem where I can't get back to the main window once I've left it. i.e program the sounds I want in the pads window then press main and nothing happens. I can move to other windows like load etc but can't get back to the main page.

I'm running 1.22

I think that I might have to format my memory and reload the os.

A simple guess is that your MAIN button is crapping out on you or possibly already broken.

I hope not its only about a year old. Do you know if there is any internal tests i can run to see ?

Unfortunately, no.

oh well that sucks.thanks. I guess I'll start taking it to bits tomorrow and see what I can do.

try taking off the faceplace just to see that the button isn't stuck. use compressed air to clean out all that dust.

I took it to work today, took the cover off and put a multimeter across the switch and its ducked. I'll take it in to the shop and see if they'll replace it under warranty with out to much hassle or I'll just try buy a new switch.
thanks for ya help.