Why my 2004 infinity g35 sedan giving me an issue after I took the battery of for about 5 hrs

I had fixed my pc valve I disconnected the positive
and negative on the buttery so the service engine
light will come of so when I put the battery back it
didn't want to start with out giving it a lil gas but
after you give it gas it drives perfect no putting or
shaking..and since that happened the a.c. starts
itself and the radio does not turn on but everything
else works fine can anyone help me I'm so ready to
put this problem to rest