hi, i have 3g 8gb iphone. its get stuck on apple logo when switches on. i have tried to put it on dfu mode to restore or update to solve this problem but no luck. it doesnt go in dfu mode. my both laptop does not response when i connect this phone. i have another iphone and that goes to dfu mode but this one just doesnt. can you please help me what else i can do to put it in dfu mode? or how can i solve this problem which just stuck on apple logo. please help………