new cd player won't power

hey, i have a 2000 dodge caravan, and took out the factory stereo. i am trying to install a blaupunkt v-line series cd player. first, to be safe, i hooked an old tape player, it worked, so i hooked up the blaupunkt and can't get power. i have a keyless entry that don't work now, turn signals, horn, radio,lights,power locks , won't work.....only when the key is turned on. i put the factory radio back in, all hooked back up, and that don't work either. i obviously blew something, i didn't really see any blown fuses. can someone please let me know what happened???? thank you, aaron.

yes there are, would most likely be a small fuse right? not a relay or those bigger ones in there? i will look again though. what most likely fuse?and what could have gone wrong? thx.