my iphone 3g is stuck in dfu black screen

ireb gets stuck at ibss.. and before it started getting stuck the phone was still black at the end

itunes reconizes it but when i tryed to restore it said cannot connect to apple server etc

so someone told my to edit my host file and to add a line they gave me i did and when i try to restore i get a new error 3002

i think its another host error

is their anyway to completely reset my host file i dont need shsh blobs i dont think am not wanting to unlock

or how can i just get this sorted i wanna update to 4.1

ive been trying to jailbreak then fix this for 14hrs

also if i install itunes on another computer could i restore to 4.1 without any problems or will it be the same?

thanks danny