IMac never came back on after installing some updates and trying to restart

I installed some updates and tried to restart, but it was taking for ever so I turned it off from the main power button but sktill does not come back on, it just stays on the first white screen where you see the apple logo and the circle going around!
Very frustrating any ideas how should I start it up again! Should I take it to the shop or is there a way to finally turn on?

Great thank you! It worked after I did that and read the articles you, link, you provided, but I finally did the archive install and have access to previous accounts too except my pictures and videos! It has a small "one way" sign on the folder pictures of the previous user (me) and it says I don't have privileges!
Any idea how can I recover these type of folders onto a new hard drive before I proceed to a new system update?
Thank you

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