So, I got a new car and fitted the stereo out of my old fiesta in this. I swapped the red and yellow power lines on the ISO harness so the stereo would come on with the ignition like it should and retain its settings/presets. After 2 weeks the stereo turned off while driving. I found out that one of the fuses (specifically the 1amp fuse) on the ISO harness had blown. I have since replaced this but the stereo will not turn on.

It receives power as the blue lights that illuminate the controls when I've got the headlights on work but the stereo does not respond at all. I tried the origional VW headunit and that works without issue.

Is my aftermarket stereo knackered? IVe had it open and can't see any obvious signs of damage, blown capacitors etc.