My car stereo, central locking and interior light have all stopped at the same time?

in my 1990 mitsubishi lancer, my car stereo, central locking and interior light have all stopped working? i pulled the head unit out, un did sum speaker wires, atached some new ones i bought to try them out then put the old wires back together which were stil connected to the old speakers etc so to my knowledge all the wiring is back the same as before but then when i turned the car off an back on again (dunno why i did that) next thing the radio wont come on? the interior light wont either an now when i get out to save looking for tommorow in the light my central locking wont work?? all because i pulled out a few wires in the back of my stereo? the fuses are not broken so what the hell has happens?? :( :(|||i would say you put the wires back the wrong way or didnt connect them properly. when you do something like that you should write down everything you do and what colour wires went where etc. also if you connected something wrong or even correctly you may have blown a main fuse, check the fuses under the bonnet and under the drivers side dashboard to make sure none are blown, otherwise im stumped.. good luck though