FRITZBOX 7590 does not connect to DSL

Hi.

I have just returned from a 10-day vacation. Before leaving I disconnected the power cables of my router FritzBox 7590, as done in the past. Coming back I plugged in the power for the router again: the WIFI is working fine, I can connect with my devices to the router, but the router does not get any connection to the internet (power LED of the FritzBox blinking constantly every second). I tried to restart the rounter, leaving it unpowered for few minutes. I also checked the DSL cable, and all looks good. Any idea what can be wrong?

Thanks!

Stefano.