Hey how are you
The flashing light means alarm is triggered and the ecm computer wont let it start .
you will need a factory scanner or equivalent to run a diagnostic scan & retrieve fault codes from the alarm module in the vehicle.
To know is it the module, The key ,the receiver, hood switch , door switch, wiring etc.. , it could be number of reasons & there is not a fuse or a relay that you can pull out to disconnect it unfortunately
Note: if you have 2 keys try xstarting it with the other key in case the one you are using lost its syn with computer
But you can try a manual reset using below procedure
Master reset Procedure
1- Disconnect Battery Cables ( Negative & Positive Cables )If cables don't reach use any electrical wire as an extension
2- Hold cables Together for 60 secs ,then let go
3- Wait 15 minutes
4- Make sure all doors are closed
5- Reconnect battery Cables
6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)
7- Enter the vehicle and attempt to start
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ASE Certfied Technician