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Have you checked all fuses under the hood?
Check all the connectors that were removed when replacing the alternator make sure everything is fully plugged in and nothing is broken.
Disconnect both battery cables (positive and negative) and hold them together for 15 minutes. Then reconnect one at a time, positive first then negative. This should reset the system.
The computer can store energy in capacitors, if you ground the positive it will discharge all power.
Do you have a scan tool to check for codes?
No spark could be a crank sensor problem.