desktop ticking

Only after a period of time like a half hour +, the desktop has a ticking sound like running your thumb down the teeth of a comb.

I have an SSD.

I will bring it to the maker in warranty but wanted to know if this sounds familiar to anyone?

I don't see any wires being hit and it has been dusted inside with air.

This happened a long time ago like a year but went away- I think. Time has a way of distorting issues as w know.

Could it be that as it heats up a fan starts to spin and that is the culprit.

I don't know, Peter.  It sounds like a fan to me.

Thank you for the reply ,Tom.