iphone 2g 2.2 v

IT ALL STARTED LIKE THIS... I BOUGHT THE 2 nd PHONE ON 12/06/08. I NEVER HAD A PROBLEM W IT, NEVER DROPPED IT ANYWHERE I TOOK VERY WELL CARE OF IT. BUT DECIDED TO UPGRADE AND myself yesterday done working well,both cydia $ installer,itunes from the SISTER. WELL HAS DU from uae the location SO HAD TO UNLOCKED THE PHONE. IT WORKED GREAT! BUT A COUPLE OF HRS LATER... Today MORNING TO SEE THAT THE 8GB WAS ALL WHITE ON THE SCREEN LIKE A FLASH LIGHT! WE PUT IT IN THE COMPUTER reset IT BUT NOW ITUNES RECOGNIZE IT =(...WHAT CAN B DONE? CAN do unlock again HAVE IT REPLACED? OR AM I JUST SOL? PLEASE HELP ASAP!!! ANY OR ALL HELP WILL B GREATLY APRECIATED =) HP Windows Vista