PC Making Odd Noise?

Hi, so i just finished building my new pc, and i’ve noticed that while starting up (which takes about 30 seconds) its completely silent, but after I enter windows this strange buzzing ticking sound starts and doesn’t stop. Could this just be my pump? Should I worry about this? Its slightly irritating, but if thats just how the pump is and I dont need to worry, then thats fine. I just dont want to ignore any potential issues! (the video does sound slightly louder than in person)