Repeated 'Force Close' and no signal - my device is unusable
Your mention of 'reset' is a little unclear, if it's:


You did a reboot and it's still broken:
it might be broken settings, but that's not easy to debug and fix manually
BACKUP via recovery first!
Do a Wipe Dalvik Cache via Recovery
Else, reinstall your current ROM &amp; Google Apps, maybe this helps
See what adb logcat outputs during boot/runtime, maybe this sheds some light
(hacky, via adb shell) You can also forcibly rename /system/app/Phone.apk to Phone.apk.off and reboot, then do a backup of all needed stuff and then reinstall your rom &amp; GApps
If all that doesn't help, consider wiping.
Titanium Backup Pro allows extracting backups from your saved Nandroid dump (from step 1)
Fully wiped and still not better:
has to be something different than settings, either a faulty Rom or a hardware issue
BACKUP via recovery first!
Install CM7.2 (see last sentence), wipe cache &amp; dalvik cache via recovery


PS: CM7.2 is out since June 16, 2012.