pnrphc.dll device can't work/no sound: actually, in most cases device problem is because of .sys files.

How would the previous sentence be correctly capitalized?
Answer: Pnrphc.dll device can't work/No sound: Actually, in most cases device problem is because of .sys files.
recommend (offer an alternative, perhaps other people that might be of help)

How would the previous sentence be correctly capitalized?
Answer: Recommend (Offer an alternative, perhaps other people that might be of help)
key to this recovery is access to energy that can power the country's fledgling health, water, and sanitation services.

How would the previous sentence be correctly capitalized?
Answer: Key to this recovery is access to energy that can power the country's fledgling health, water, and sanitation services.
a man moves amongst members of the public. gradually smoke begins to creep out from his trouser leg.

How would the previous sentence be correctly capitalized?
Answer: A man moves amongst members of the public. Gradually smoke begins to creep out from his trouser leg.