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Hello… I purchased an Iphone 6 plus… the screen always stays black no matter what… and the only way I can connext to my desktop is by putting it into DFU MODE! I tried to update and restore, but it always fails and gives the error 4005! I have tried different cables and computers and everything! How can I fix this? It is a hardware problem not a software problem!

Hello, try this https://support.apple.com/en-us/HT201444 also try to uninstall iTunes, Apple Software Update, Apple Mobile Device Support, Apple Application Support and Bonjour then reinstall iTunes. http://www.apple.com/itunes/download/