Thanks guys. You were right. It was one of the belts that was loose. Initially when I checked it, everything seemed fine. I called my friend who's an engineer and he also suggested the belt. When the car wouldn't start, I checked again and sure enough the belt was REALLY loose and was on the verge of coming off. Everything was replaced but now the car won't start. I checked the connections to the battery (Nino's Rally Cell) and they're tight. All I get when I insert the key in the ignition is the beeping that a door is left open. No lights anywhere came on including the dome light, ashtray light, gauge cluster lights, etc. I checked the battery and replaced it with the OEM (which was fine before) and nothing. I looked at the fuses and they seem fine. I disconnected the battery and reconnected it and nothing happened (my Viper alarm usually goes off when I do this but it didn't this time). I checked both batteries and they're fully charged. I did notice that when I tried jumpstarting both sets of batteries I didn't see any sparking from the terminals which almost always happens when I jumpstart cars. I'm really frustrated and am seriously considering getting another car. Help!