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They all looked fine to me, but I'm not sure if my untrained eye would be able to tell anyway. Still, they appeared to be ok.

Usually the top will be bulging or split. The rubber plug on the bottom may have partially come out as well. Its fairly obvious when you see them.

Do you have a spare PSU lying around that you can plug in? You don't have to mount it so it can be a regular sized PSU.