I have disconnected the battery, and the car won't start

I disconnected the battery to work on the car and replace the AC blower controller. After finishing the car assembly and reconnecting the battery, the car cranks but does not start. The car was working perfectly, and I just replaced the spark plugs and cables. Any advice? I think the alarm system might somehow be blocking the car. I've tried locking and unlocking the car again, but the engine still won't start. Thanks for your advice

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If MB has its own factory security system, is there an indicator informing you of its various modes (off, on, blinking, flashing)? Any owner's manual info about security? If security is not preventing engine startup, then you may be diagnosing; fuel, ignition or both. Try separating factory immobilizer from starting issues to narrow the problem down.


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