1. What are the specific symptoms you are experiencing?
* Does the engine crank but not start?
* Does the engine not crank at all?
* Do you hear any clicking noises?
* Do you see any warning lights on the dashboard?
2. What have you already checked or tried?
* Have you checked the battery and battery terminals?
* Have you checked the starter motor?
* Have you checked the ignition switch?
* Have you checked the fuel pump?
3. Any other relevant information?
* What engine is in your Regal (3.1L V6, 3.8L V6)?
* Have you recently done any work on the car?
* Has the car been sitting for a long time?
* Is there any smoke coming from the engine?
Once I have this information, I can give you a more specific list of things to check and troubleshoot steps you can take.