Some of the Buttons on the phone do not work.

The best thing you can do is sending it to a professional. By opening the phone you can cause more damage?

Just in case, why can't you execute the hard reset? If you don't know how, it's in the user guide -p. 171...

FYI about Hard reset
"...Performing a hard reset deletes all the entries in your phone. However, you can restore all previously synchronized info the next time you sync (see ?Synchronizing contacts and other information? in the user guide)..."