Mike234956

Hey I just bought a 2006 Lexus IS250 off friend of mine, it had a bad alternator and bad battery. I Replaced The battery and I want to plug the battery in the next morning and the alarm went off, I went over to the driver side and unlocked it with the mechanic key and the alarm shut off. Ever since I did that the car will not start, the dash will not turn even the radio. The push and stop button to start the car won’t even light up but the headlights and interior lights work just fine and I just replace the alternator and that didn’t fix anything. A lot of forums say that it could be a grounding issue or a blown fuse. Can anyone help me? Thank you.