Stereo problem
 

Hope someone can help please.
I have got a Sony stereo for my 97 WRX & when I plugged it in the first time it worked ok,when I plugged it in again to fit it properly I heard a bit of a crack type sound & nothing worked,When I turned the ignition OFF the alarm led started flickering like crazy & there is a quite loud ticking noise coming from under the instrument cluster,When I turned the ignition back ON it stops but there are no lights on the dash.Have I knackered a relay? My clumsyness is fkin unbelievable,I can make a pigs ear of anything.
The internal fuse box is a mofo to get to.