Pontiac Repair: 2000 Sunfire, mechanic friend, head gasket

Question
QUESTION: My car will turn but won't start...we've(my boyfriend) checked fuses, wires, battery, everything(he says)He's about ready to smash it to bits...the head gasket needs to be replaced(recent problem)his mechanic friend tried taking a sensor out but it broke, now he can't get it out...help, please!!!

ANSWER: Hi
If the head gasket is failed, it is likely that the vehicle is loosing compression. If this is the case, it will not start.
I Hope this helps
Pawl

---------- FOLLOW-UP ----------

QUESTION: I forgot to mention it's a 2000 Sunfire, and this happened a couple times before the head gasket went?

Answer
Hi
Whats the "theft" or "security" light doing?
Is in on steady, on for about 7 seconds then off, or on and blinking?
If it is on and blinking, try this.....
Turn key to run  the system enters the long tamper mode, ensure that the system completes a long tamper mode cycle. During the long tamper mode cycle, the THEFT indicator will flash for the full 10 minutes. The instrument cluster and the PCM require the full 10 minutes in order to complete the learn cycle. Ensure that the ignition switch remains in RUN until the indicator stops flashing. If you turn the ignition switch before the indicator stops flashing, ensure that you repeat the long tamper cycle from the beginning.

Hope this helps
Pawl