Hi I have an iphone 3gs. It had a cracked screen. So I bought a new glass screen/digitiser, and succesfully replaced the screen. Updated the ios to 6 in Itunes, and everything was working fine, except for the ringer speaker wasn't working (only sound was through the headphones). So I opened the phone back up to check all cables/connectors were all correct and everything seemed fine. Booted th ephone back up, and now i just have a white screen. Itunes still sees the phone, and i can sync, restore etc. Any ideas?