Possible CPU overheating after motherboard replaced?

safour79

Reputable
Nov 2, 2014
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4,510
Hi guys, I have a Dell Inspiron 3521 laptop which I got back from the supplier 2 days ago after repairs for a USB port problem. They replaced the motherboard and my wireless mouse which they said was faulty.
Now when I use the laptop, the fan is permanently audible. It didn't do that before. It was pretty quiet. I hope something's not overheating, triggering the fan to go full speed. I'm not very literate when it comes to IT stuff. Any advice before I take it back to the guys that repaired it?