HP C4780 - not able to connect to wifi

Hi
My printer (HP C4780) doesn't seem to try to connect to anything while running configuration software. I tried to follow the procedure of restarting it (removing power cords waiting - I gave it whole night off).
I have full details of my wifi network because I configured it by myself, it's standard WPA wifi, I tried to chaning channel to 11 to help software to find the printer but none of this worked.
I downloaded the newest drivers from HP site for Mac and PC ( I have access to both , tried on both same result ).
Printer is able to print if I configure it to use USB only (I wanted it to by wifi but it never worked), but after uninstaling everything and trying to install again with wifi it asks to connect to USB at some point - so I did it, it finds the printer without problems and then it goes to network setup wizard and it doesn't find any networks - I put my SSID manually and when I hit next it says the printer must be connected to USB (it's connected I even tried to take a break and restart it at this point ).
Also the screen on printer always shows HP logo and progress bar that slides to infinity - I left it for 3 hours and still like this. No amount of restarts helps. But if you connect it to USB system can see the printer. Not sure if that's how it's supposed to work, the only time it was different was when I first turn it on and when through the setup procedure (setting language, cartridges and so on).
Let me know what to do - seriously restarts won't do...
Thanks,
Jedrzej

Would you be kind enough to help our effort here in HP to understand this failure? We have seen a rash of C47XX printers lock up on network installs with the HP logo on the front panel. We have not yet found a solution to the problem.
It would help us immensely if you could let me know the serial number and firmware revision of your printer. Both of these will be on a Network Config Test that is printed from the front panel of the printer (Setup [Scan] > Network).
Thanks in advance.
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

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