Unfortunately your keypad is probably foobared. I know I have a "new" keyboard and I installed it in my current working 650, and the menu, I, K, M, Alt, and <- [backspace] keys do not work. The old one just doesnt click anymore on the ALT and right-shift key. I put that one back in for now.... If you do buy a keyboard, be careful with the install. My first 650 I got from a friend who tried to fix it before, and what happened was is he broke the connector for the keyboard off the mainboard, damaging the traces and all..

Wondering if anyone has any tips....
My recently purchased used 650 has been working fine for a few weeks.
Today I am having problems with certain keys. Space bar, Alt, Home, Delete and others. Some still work. I can't get around many places with the home key out especially. It hasn't gotten wet. I have no 3rd party software. Ive tried every reset except a hard because i dont have any sync software for my contacts. Anyone have any ideas on how to fix this keypad?