626 2000 only goes in reverse, now doesn't start
 

Hi - brand new here - never had a reason to seek help - car seemed bulletproof.
2000 626, 100300 miles. no problems ever - now, when most needed it has a problem. went out after work , started car - would only go in reverse - no matter where the shift was placed. after stopping the car it never started again.
hope a simple fix is an answer. do i need to replace the pcm? is there a computer for the trans that could be a problem? Help please. Thank s for whatever advise is out there that can help
dave