Imac will only connect to my home wifi via ISP hotspot. All other devices are fine (iphone, ipad etc). its driving me nuts!

My imac (2 yrs old) will not connect to my home wifi with the exception of my ISP hotspot. All other devices are fine (iphone, ipad etc). I have changed my ISP recently and this issue has never happened before. I am with my current ISP for about 7 weeks and this was not an issue for the first 2/3 weeks. Went through the usual set up procedures but alas...nothing. Message states unable to join network! Don't think it is an ISP issue as all other devices work perfect...or is it? As I said It did work at the start, but no longer. I recently moved to NJ from Ireland, so my imac is a European model (don't think that makes a difference?) I can only presume it is the settings on the imac. Any help would be greatly appreciated! Thx

Hi - out of action for a few days. To answer your questions:
- and click on Advanced and make sure everything is correct - all in order
- Also check on your router's website to make sure the iMac is recognized there - it IS NOT recognized here as other devices are
- do you by chance have your router set up to do Mac filtering? - i don't know..how do I check?
Thx

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    ~~~~~~~~~~~~~~~
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