iPhone 3G Error 1013 after restore to 4.2.1

Hi, I Have and iPhone 3G and after the iphone has asked me to do a restore i'm now stuck on the recovery mode and the error 1013 in iTunes.

i've tried these thing:

Restore on ans other mac and 3 other Pc's(Windows 7, Vista and xP)

remove the ''gs.apple.com'' line on my mac( there was no ''gs.apple.com'' on my other mac ans Pc's)

I've also tried to restore in DFU Mode With no succes

I really need my iPhone to be fully fonctionnal

Thanks for future helps