This is something A600s like to do every once in a while and I STILL have no clue why.. Some keys stop responding. Never happened to me that all the numbers went off but some letters did. So try this:
Open up your A600. CAREFUL with the keyboard ribbon!
Unplug this ribbon, and reconnect it. Check that it is firmly put in its place. try not to break it, the thing is very thin!
Power up your Amiga and try the numbers again. f they still dont work, you might have got a broken keyboard (or maybe some CIA chip/s?)
I hope this little tricky solves your prob. If it does, any time teh A600 feels like doing it again, repeat the procedure. It will be just fine
