As the title says, refitted the stereo this morning all was good, settled all the cables about, pushed the stereo into the dash, all was good, tried the stereo, don't work, no power to the yellow wire(power to the red) though), clocks not working either so I though fuse, but no that is good, the car doesn't start now either, all lights come on, but nothing when you turn the key,
Any ideas?

flat battery???