there was a lot of advice available, but never a solution.

How would the previous sentence be correctly capitalized?
Answer: There was a lot of advice available, but never a solution.
significantly lower idle gpu temperature

How would the previous sentence be correctly capitalized?
Answer: Significantly lower idle GPU temperature
one should bare in mind that aircraft built at that time were "consumer goods" - buy, use and throw away when spent - and were never meant as as something which should be kept flying for more than half a century.

How would the previous sentence be correctly capitalized?
Answer: One should bare in mind that aircraft built at that time were "consumer goods" - buy, use and throw away when spent - and were never meant as as something which should be kept flying for more than half a century.
remember that murales have existed since prehistoric times, when the men drew on cave walls, to warn of dangers or to tell stories of everyday life.

How would the previous sentence be correctly capitalized?
Answer: Remember that murales have existed since prehistoric times, when the men drew on cave walls, to warn of dangers or to tell stories of everyday life.