U3014, stop displaying image from pc also every buttons do not work

Goodmorning,

I attach my issue to this post because I have a similar problem with Dell u3014

From the night to the day, The monitor does not show image from pc, neither dvi neither hdmi neither dp.

If i disconnect power from monitor then i reconnect power the logo of Dell appear but every button not working. only white led appear on power button.

I changed all cables and I try to use with another pc with same result.

Could you help me?

I want to repair but I live in Italy near Bologna.

Could you send me to a service repair centre near my zone?

Thanks in advance

Davide P