Ford Focus 1.6 Zetec (53)5 door estate - radio CD600


Before I start spending potentially what could be hours fault tracing I thought I would ask if anyone has experienced this problem before.

When I parked up the other day I popped off the removable radio button pad for security. When I put it back in the radio firstly refused to work, despite checking connections and cleaning etc, it eventually decided to wake up but now the front left door speaker doesn't work at all. The left back door speaker does but quieter than before, the right hand side is fine.

Anyone got any ideas what this may be?

Any help much appreciated. I won't be checking this forum again ubtil this evening so I will say thank you in advance for any responses.