Radio not working.

[kurkjones]

As above, bought the car with a Kenwood Single din radio, has an ISO harness fitted to the loom but went to change my radio to a double-din Sony, the plug still fits the new radio, and now it's not working, the radio is brand new.
My car is kitted out with Clifford Proffessional Series 3 alarm system and immobiliser/turbotimer etc and I'm wondering if there might also be some anti-theft system for my radio, if such a thing exists? No idea. Please help me sort my radio out! xD

[mr2garageswindon]

Check for live, switched live key at 1st click and earth to the unit be the best place to start. Or simply plug in your old unit and see if it still works.