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you must be more specific when you turn the key does the engine crank and try to turn over or is there no power at all(this means you turn the key and there is nothing no dash lights nothing)or is there lights but no cranking you see you need to supply more info to help me help you or anybody else
If this car is a automatic then it could be the inhibitor switch --wherever that is as please remember that a big petrol engine like this with a auto box is something i just do not see here in spain,try paying 10 dollars a gallon for fuel then you will understand why we have diesels with a manual gearbox
Do this to check if it's a bad battery, turn head light's on and try to start it, if head light go to dim or off, bad battery not holding a charge, if light stay on ok, then this will take two people tap on the starter kinda hard with a hammer or something you can reach it with while some one hold's to key to start, if it start's bad starter or trys to turn engine replace it.
If the battery has gone dead, it could cause the security system to go into full lock-up mode. If it has locked up the accessories will work after the battery is charged back up , but the power to the starter will be cut off and it wont turn over. You need to do the 30 minute learn procedure. A GM dealer will print it out for you and you can do it yourself. It's very simple if you follow the procedure exact. hope this helps and good luck.
i suspect a faulty starter check for voltage output at the starter solenoid with a multimeter. or (shade tree) tap the starter with a hammer then attempt to start. if the vehicle starts after the tapping replace starter.