Diagnostic help needed

[06-997S]

My 2006 997 C2S ran fine a few days ago (except for the PCM display, but that's another topic) and today the car does not start. No starter motor crank, the turn signals/head lights flash rapidly, and the driver's side window creeps down about 1/8th of an inch at a time. I've been searching the forums, read the owner's manual, and searched with Google without any luck. The battery is about 2 years old. Can anyone point me in the right direction on how to diagnose this mystery?

Thanks!

[Loren]

Have the battery both load tested and specific gravity tested -- it would not be the first time a 2 year old battery has failed.

If the battery is good have a look at the ground strap (TSB 8/06 0101 Breakdowns Due To Loose Ground Strap).

[06-997S]

Have the battery both load tested and specific gravity tested -- it would not be the first time a 2 year old battery has failed.

If the battery is good have a look at the ground strap (TSB 8/06 0101 Breakdowns Due To Loose Ground Strap).

Thanks for the feedback. I verified the ground strap is clean and secure. The local AutoZone tested the battery this evening and reports a dead cell. The battery was installed by a different dealer in June, 2009...about 2 months before I bought the car...so I will check with my local dealer on any potential pro-rated warranty.