Serious Mac Problem : Why does my mac went really slow and then when I want to re-open it, it won't let me

Yesterday I was working on my computer.
I was about to start a new text on word.
Suddently, the mac keeps on showing me the circle with all the colours for a lot of times.
Then after what maybe 5 or 10 minutes, it got stuck there.
I couldn't do anything except to shut it down or to wait.
So I closed the computer and I came back the other day to see if it wasn't just a little problem.
I open the mac and the Apple sign showed up and I had to wait for atleast 1h so here I am wondering if my computer is broken or just really old to work properly.
If anyone of you knows what's going with my mac or if you ever had that type of problem with your computer and you know how to deal with it,
please help me out.
thank you in advance
Audrey

Resetting SMC as well as NVRAM could solve the problem.
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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