Ive replaced the factory fit stereo with an after market one but doesnt power up. So I put the original one back in and that doesnt work. I have checked all the fuses but all r fine. Everthing else works including the computer but no power seems to going 2 the stereo. I have also disconnnected the battery for 2 hours but that hasnt cured the problem. Please help as I dont really want to run wires from the amp feed to the stereo. Cheers