How long did it behave properly before the beginning of March? Did you mount the motherboard on to the case or did you install it on small, brass stand-offs?
Can you give us full information of the parts?
Please don't turn it on until you can be sure it's safe to do so.
i built my pc in the end of 2019 and this stuff started at the beginning of March. I have a MSI z390 a pro motherboard gtx 1650 I5 9400 9th gen cpu I also use the stock cooler that comes with the cpu. I also have to continue using the computer I use it for school.