I found out I had to get uninstall flash and get a fresh install for it. Anyway, it works, now.
I had previously seen instructions for cleaning a computer. Looks like everybody has something different to add. For example, one guy suggests cleaning the computer after it's down to room temperature and only using short bursts of air since it's so cold, so it won't shorten the life of any components.
Another guy suggested using q-tips for most of the cleaning and said it would be better not to blow the fan with that compressed air since it might put a bit too much stress on the bearings. He likes to insert a q-tip in the fan to keep it from spinning.
I imagine somebody else might have a different idea.
But, I have a feeling that for most of these videos the instructor has to fit his time within a given time frame.