Error 21 and 3004 while restoring iphone 4 - Itunes / IOS last version! HELP!!!

Hello guys, i have an issue restoring my iphone 4... 1 was charging it and suddendly black screen appears.. just with apple logo when i connect charger, when charger is disconnected just black screen.. y though that was battery problem, i bought new one and is already installed.. now, same problem.. y research internet and i found that the solution could be restoring it.. so.. i turn it into DFU mode (Itunes mode) now i just see ituns logo on screen when i connect..
I have last version of Itunes (11.1.4) on my computer and i Had last IOS in my iphone 4.. when i try to restore first of all i see error 21.. i did something for fix hosts file and now i see error 3004..
I really apreciatte if somebody can help me, i don´t know what shall i do..
By the way. my iphone 4 is completely original.. i mean.. not jailbrake
Please help
Thanks all

error 21
https://discussions.apple.com/message/18198103#18198103
erroer 3004
https://discussions.apple.com/message/23878993#23878993
https://discussions.apple.com/thread/4034118

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