I had the same problem on an 08 Equinox. After jumping the battery, recharging, checking all fuses and swaping some of them, I returned to it and it started like if nothing had been wrong. Then I realized that I used a different Key and remote.
I remote locked it and used the first remote and key again and the problem came back. I went back and forth a couple of times and recreated the problem. PROBLEM was my regular key lost its program. I reprogrammed the remote and key and lived happily ever after. good luck.
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