Turbo Quattro

Last week I buyed a 3g+ unit (8R1035666) from poland.
Today I tried to connect it: I replaced my 8T1 unit with the new one and I inserted also the new console.
I attached the quadrblock, fiber, sat antenna and monitor.
Nothing appeared to monitor: I can hear the fan but no image on monitor and no sound.
I attached the vag cable and tried to connect to 5f but I got cannot be reached.
How can I know more about the unit faulty?
Is there something more I can try to do?
Thanks very much

Sergey,
can you help me?

I think you have bought damage headunit , but :
1 after connect all connectors and optical jack - turn on key to start car
when you replace 3g to 3g plus - the keyboard is not working (you need to replace keyboard from 3g plus too) And when ignition on than headunit mast to start
2 just check that main connector inserted full

I tried again. The connectors are inserted well but nothing starts. I was wrong: the fan doesn't start.
The power line should be in the main connector.
If I insert my old unit this starts automatically.
Should be possible repair it?
Who can repair it?
Sergey?

send headunit back to poland and refund money

if headunit not started than nothing help you