Yes, no amount of fiddling or anything will get it to start. Tonight I had it towed home after trying to start it for an hour. The moment the car was off the flat-bed, it started right up... GO FIGURE! GRRRR... it's quite a nuisance.

The part is cheap, so I'll go ahead and order the safety neutral switch along with the flex disc and idler arm.

If the car has been sitting for an extended period of time (ie Overnight), it always starts... no problem.

The tow truck driver tonight suggested maybe the starter overheating? We'll see.

Thanks for the input.

BTW, this is the FIRST time that I have ever had to tow my car... and I guess, in the end, it didn't really have to be towed anyways! Not too bad for nearly 140,000 miles.

PS: I snuck a pic of my baby benz's first trip on a tow truck! I'll post the pic later.

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)