Heard a sort of snap noise while testing an X-tec ATX-500WB+P4, even though computer kept going 
Switched it off as fast as I could, and heard something rattling when I shook the power supply
Looked inside to find one of its SAPCON caps had popped its canister, which was the thing rattling - even though the SAPCON's sleeve remained in place
So overall it felt like a squishy capacitor, albeit one without a top cover
On the right is the second SAPCON that I replaced

Switched it off as fast as I could, and heard something rattling when I shook the power supply
Looked inside to find one of its SAPCON caps had popped its canister, which was the thing rattling - even though the SAPCON's sleeve remained in place
So overall it felt like a squishy capacitor, albeit one without a top cover
On the right is the second SAPCON that I replaced
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