The turbo wouldn't prevent you from starting the car. There's something else going on there.
And don't be so sure your engine is fine just because you did a compression test. You could have blown a head gasket, cracked a head, or fried you crank and/or rod bearings.
I had a similar incident last winter when my thermostat froze and the car got hot. It seemed to be fine, but about a month later it started eating oil to the tune of 1wt per week. I knew I had a timebomb on my hands.
I sourced a new block, and did the replacement. When I cracked the case open, I found I had 3 spun crank bearing and all crank and rod bearings were scorched. The through bolts that hold the block together had gotten so hot they turned from golden to black everywhere but on their heads!!!