Sprint HTC Hero :: Can't Get Mobile Network To Turn On

I don't know if it was a settings app (Quick Settings by Sergey) from the android market that caused it, but after uninstalling that app (the only other one i use right now is the lock screen widget - which i just uninstalled), i can't turn the mobile network on. i've tried the airplane mode trick, gone into settings, soft reset, etc. any ideas in the manage applications? i'd rather not do another hard reset (had to for the google account). i called htc and they were useless - with no trouble shooting, they recommended a hard reset and to not download apps! btw, i'm on a non-rooted phone.