My iphone 4 wont come on i attempt to do a restore on itunes but it says error 4005

my iphone was working fine, then half an hour later my screen is black and it wont switch on,
i have  tried all suggestions such as hold down power and home button for 10-30 seconds, charging doesnt help, it was fully charged,
i tried holding both down then plugging into computer loading itunes and letting go of power button
and only holding home button, it starts to restore then says error 4005 cannot be completed or something,
help !

http://support.apple.com/kb/TS3694#4000
If there’s an issue with the USB port, cable, dock, or hub, or if the device becomes disconnected during restore, try troubleshooting the USB connection, then troubleshooting your security software.
To narrow down the issue, you can also change up your hardware:
Use another USB cable.
Plug your cable into a different USB port on your computer.
Try a different dock connector (or no dock).
Add (or remove) a USB hub between your device and computer.
Connect your computer directly to your Internet source, with no routers, hubs, or switches.
If you checked your connections and are still seeing the error message, check for hardware issues.

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