Corsair 240 Air

The usb3 cable plugged in? I find mine very loose and can get pulled out very easily had this problem myself when I first had the case and thought they didn't work just turned out it wasn't seated right as it came loose.
 
Some Corasir cases only support USB3, it could well be only USB2 is supported by your hp motherboard which could be the issue.

Do you have the Model details for the motherboard you have?
 
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