BUICK RENDEZVOUS IGNITION SWITCH KEY

I Was Wondering If I Replace My Ignition Cylinder Will My Car Start? My Key Has A Transponder But The Locking Cylinder That I'm Buying...

And I Need To Put It In Neutral.

Went To The Store To Pick Up A Few Things And The Car Started Right Up As Usual When Leaving. Upon Getting Home, I Went To Turn The Car Off...

I Can Start The Car And Turn It Off But Not All The Way, So The Accessories Stay On And Drains The Battery And I Can't Pull The Key Out...