When I turn the key to start I hear a load rattle sound

check --clean and test battery and connections --------

Check and clean your battery post and check the battery voltage you should have no less than 12 volts.

Sounds like alternator belt burned and broke.

From what you're saying here, I believe that you simply have a bad battery. Most batteries only last 5 years, much less if they're left to sit in storage periodically. You really should charge the battery overnight and do a load test on it the next day. The person(s) you spoke to at BMW were probably sales staff and not actual technicians. Costco has very good batteries at reasonable prices.

sounds like aaa might have popped your main fuse. i would call aaa back and tell them your problem. they are responsible.

There is a possibility that the battery is bad and not making the fuel pump work properly or to it's right pressure. Cna you hear the fuel pump come on when you turn the ignition switch to the on position... Have someone unscrew the fuel cap and listen near the hole you put fuel in to see if they hear a humming or vibrating sound when you turn the key to the on position.... If you hear the fuel pump come on Check the battery... It might have good voltage but the amps might be week... It could be the battery...

I have the same problem with my 2007 Escape Hybrid... First experienced it about 1 year ago. The vehicle produces periodic sounds like an electric motor running for several seconds. I believe this is from the motor driven safety relay that disconnects and reconnects the high voltage hybrid battery when the vehicle is not in use. I also can hear a high frequency scream that sounds like a switching inverter power supply. If the vehicle is unused for a day or two the 12V battery is discharged and a jump is needed to start the engine. Ford service could not diagnose the problem. The +12V battery tested OK, but since it was almost 3 years old it was replaced anyway. This helped for a while, but the problem returned after I recently left the vehicle unused for several days. I know the battery is good, it tests OK and is less than one year old! Somewhat reluctant to go back to the same Ford service agency because of their previous failure to fix it. Please advise if you have found a solution or have additional information. This is the only problem I have ever had with the hybrid Escape, but it is very annoying. I am forced to carry a jumper battery to make sure I don't get stranded.

sounds to me like the alternator is no good or there is a wiring problem.

It has been suggested to me the problem could be a belt tensioner gone bad. Sound right to anybody?

Yes I have this problem and my car Mazda61 2006 is with the Dealer. They couldint find the problem yet!