My wife parked the 2008 Elantra in the garage. 2 hours later I went to leave and the car started fine, but all the dash lights were on, (ABS, EPS, Battery etc.) and the lights for the AC were on but the fans didn't work. I also had no power steering. What the heck happened???

 

********** FIXED!! ***************
I took the negative leads off the strut tower and sanded them clean, as well as the strut tower. Re-assembled and everything is working normally. My cost 10 minutes of time. Hope this helps someone else!