[ppbon]

You need to have the error code read so that we can tell you what the issue is.
The CEL can be triggered by any of over 100 different things.
When the car doesn't crank the first thing I'd look at is the clutch interlock (assuming it's a manual tranny).
Are you depressing the clutch pedal ALL the way down? Check your floor mat to make sure it's not bunched up under the clutch pedal.
When the coolant/heat indicator light is blinking it means that the car is low on coolant.
Check the level and if needed, top off with distilled water.
Also, if you haven't done it replace the coolant cap with the newest version (04). Older caps tend to leak.
Finally, just to be sure that you don't have a cracked coolant reservoir, peel back the rear trunk's carpeting and check the trunks bottom just under the coolant reservoir.
If you see ANY coolant your reservoir is cracked and needs to be replaced.
Happy Boxstering,
Pedro