Question PC Beeping. Help?

May 20, 2020
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Just some context, I was leaning over my pc on my desk, trying to plug in USBs and it starts beeping loudly. I may have been putting slight pressure on the case. It continued to beep until I got worried and shut it off. Only after completely shutting down did it stop. After loading it back up, there are no signs of issues, maybe slight latency compared to before if anything? I notice my C: drive is hitting 100% a lot but I had never checked the task manager before the beeps to know if that was normal. No error messages popped on the screen at the time it was beeping either and it seemed normal, except for the beeping. The beeps didn't sound like the beeps that happen when you have errors while posting and were loud and like an alarm clock originating from near the top of the case, where there are fans, the motherboard, and CPU. Here's my set up just in case.

Motherboard ASUS PRIME Z370-P
Processor Intel® Core™ i7-8700K
Video Card NVIDIA GeForce GTX 1080 Ti - 11GB
RAM XPG 16gb (2x8gb)
Power Supply 1000w High Power
Processor Cooling Corsair H60 Liquid Cooling
Operating System Windows 10 Home