Hey guys so i need your advice i woke yesterday and went to work when i arrived the key came out of the cylinder and to the off position but the car continued to run normally,i then turned the key forward and back slowly and it shut of but felt the cylinder a little loose. when i got out i went to start it and nothing i mean nothing! the cars dome lights come on when i open the door the headlights work when i pull the switch hazards work starter battery cables and starter are new around January and February.so i changed the cylinder assuming this was it and went and got a new key with the V.A.T.S. pellet to the right resistance, but once again nothing same thing as before. any suggestions or ideas what it could be?

BTW its a 1990 RS