2006 Lexus Weird Noises

Recently my 2006 Lexus IS-250 has been making weird noises. It started off with a popping sound that I thought was coming from the radio but continued on after I turned the radio off. Today while using the turn signal the sound that it usually makes persisted even after the signal was off. This was then followed by an electrical screeching sound. The car has also been having some problems turning on. Any ideas of what it could be? Family member suggested it was a loose wire.