Hope someone can help here, I've just installed a Sony CDXS2050 in an old shape mini. The only wires I had were power, earth, aerial, 2 x sets of speaker wires. I bought an ISO block and connected these wires. Connected the unit to the block, CD player whirred into life, reset the unit and fitted the front fascia. All seems ok but i've got no lights and no way of getting the thing to work. I know theres power getting to it because i can insert and eject cds but thats about all! can anyone help??