Issues with PC ownership.

So I am getting a periodic noise from my PC almost like something being tripped. That usual tripped noise. It happens every so often, not like every minute but maybe every hour or so to 30 minutes. I clean it every time. Its an MSI Trident X Plus prebuilt. I spent too much on this and I am worried somethings already wrong. i cant get the side panel off to investigate. Manual says to push and draw but it wont draw, i dont want to force it either and break anything. I want to build my own and move my RTX 2080 TI to a new case but I dont want to violate the warranty. This PC is worth more than me. I am paranoid at this time. Can someone help sort me out before I lose my mind. I have plenty of questions

Are there any filters that I can use on the MSI Trident X Plus for the excess dust in my room?
How high or how low should the tower be placed for efficient cooling and minimal dust intake?
Where would a decent place be for an air purifier for efficient air cleaning for the PC?
How can I effectively clean a compact PC?
What should I be worried about the most with these kinds of PC's?
How can I properly maintain it and how often?

Iv'e never had a PC like this and it was a gift. I am a major gamer and it was a blessing plus its the most expensive thing I own as of right now. I am sorry ahead of time if I posted this in the wrong place.

So you know how some powersupllies make a click noise when they turn off. Well it sounds like that while its running but it doesnt happen often. Maybe 20 or 10 minutes in between.

When a pc shuts down it clicks as if its cutting its power. I hear the same thing as its running. My hard drive is fine. Everything is running normal.