Problem with UR22 connections

Hello, I was wondering if anyone could help me with the following problems I am having with my UR22;
I have had it for over a year now and it has always been working fine, but recently for some unknown reason it has stopped functioning. My computer reads it perfectly well when I connect it via USB and cubase 7 can tell it’s there.
But when I connect a jack cable and a mic cable the UR22 doesn’t seem to pick them up, as when I try to record or play there is no sound. Also, when I turn my +48 option on for my mic, a weird sound starts coming from the headphones, almost like a metronome…

Any kind of help would be much appreciated, thank you!!