The most common reason for filters not restarting is that they are not properly primed. But it's been more than 20 yrs since I had a HOB and can't remember how it's done. I assume the chamber is full?
Sorry I missed your edit, maybe it needs a new impeller?
Hello, you may have to pull all media fill w/water & get flowing. Once started add media to filter to see if it starts to rattle again. I think bio ring may be squeezing impeller over or rubbing. Hope this helps!!!!!
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