gear is stuck in P but shows D on the dash. I shut it off and it won't start now on 2007 Chevrolet Trailblazer SS

I put the car in park but it shows on the dash it's still in drive and continues to roll forward. I placed my foot back on the brake but now the gear is stuck so I put on the emergency brake. I shut the car off and now it won't turn back on. Can I give it a jump start with cables and what should I do about the gear being stuck?

Asked by for the 2007 Chevrolet Trailblazer SS
poss broken shifter cable, seek help
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