iPhone 3GS 32GB White Back, Booting to blackscreen.

I have replaced the digitizer. It was working before but with cracked digitizer. It is seen in itunes 12, It restores fine, unlocked IOS 6.1. no errors. Deleted all apps to stop conflicts. Just goes to apple then boots to a blue/black screen. Will not fully boot in Redsnow 0.9.15b3 when a Recovery fix it is performed. I can put in to recovery and DFU. Home and Power/Sleep buttons appear to be working fine. Taken apart and checked the cables 1 through to 3 seems fine.

Battery has been fully charged to 100% not replaced but seems to last a couple of days at least.

Any help suggestions would be very much be appreciated.

Much Later.... After some more research it sounds like proximity sensor issues. Can't anyone confirm this as a good bet.

Many Thanks in advance :)