When I am really stuck trying to get the case open, I do a quick Google search and often can find an online manual or video. Saves my knuckles and sanity.
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If it doesn't become obvious to me right away how the case is designed to open out comes the pry bar. I used to spend a bit of time to do it properly but when your break down pile is above your head and time is limited nuts to that. Just wear safety glasses if you're going to go that route.
Cats paw get's by security screws with ease.
Last month a yard by Me was paying .16 cents a Lb. for tower's
Bandit