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Filter not working suddenly
I unplugged my filter while doing a water change, once I plugged it back in it started making a grinding and popping noise. The filter is a tetrawhisper EX70 and it is a self priming filter.
Pull it out and pull it apart around where the intake meets the canister there should be an impeller make sure there's nothing blocking/jamming it up. It sounds like something may have settled during your WC and jammed it.
Thats typical of a filter that needs priming, I know you say its self priming but try pouring water in the top when you switch it on, the noise sounds like the impeller spinning with no water around it
I pulled it apart and rinsed everything off put it back together and it started working
Good stuff! After some time its good to do. Your filter will thank you, and save you money in the long run. Maybe your ears too!