Boosted Falcon

hi guys i got an Xr8 ute 2004 BA ive taken out the radio to put in an after market radio put back the original radio
now radio does not turn on
no air con no display or lights on original radio central locking does not work with switch nor does the the light switch
speedo and tachometer do not work either any ideas
Kind Regards
John Newburn

Thanks Guys not fuse problem more serious

Fuckan V=RI aye bloke.

have you done any kind of troubleshooting like checking the fuses?