I recently had to reset my G1 back to factory settings because the firmware got corrupted somehow. If the Home or Call button stops working after your battery dies, just revert it back:
- Power off the G1
- Hold Home Key + End key for 20 seconds until you see a picture of the G1 with an exclamation point above it
- Hit Alt+W on the keyboard
- Reinstall your precious apps again
You’ll be asked to register your account in the beginning which shouldn’t take long. Remember to sync your data before you revert everything: Settings > Data synchronization. Good luck!
will this fix the problem?
Oh yea, at first I thought it was going to work again but it didn’t. I realized how much I needed the home button so I restored it to factory settings. I called tmobo and they also suggested doing it. Remeber to sync your stuff!
You can also reset by going to Settings > SD card & phone storage > Factory data reset.
Mine didn’t
my end call buttn doesn’t work 
what can I do???
You can reset it by going to settings > sd card & phone storage > factory data reset. Remember to back up your data and sync your contacts. I had to do this again last week. Good luck!
Mine still won’t work, even after 2 factory resets…. any suggestions are Much appreciated
What version are you running? Are you rooted?
This happened to me again today, and I found this solution:
http://da.mned.co.uk/2010/07/g1-home-call-button-not-working-and-lock-not-working-fixed-without-reset/comment-page-1/#comment-299
It worked!
Awesome! Thanks for the link.