Hard to explain issue with Laptop and screen

Just as the title states, my new bought laptop is extremely weird. I am currently having 2 issues, and yes I've searched already(even though its hard to search when this is so confusing)
1. Whenever sound is played on the laptop, WITH and WITHOUT HEADPHONES/MIC plugged in, the left side laptop speaker lets out a static sound for a while, and if a sound on the laptop ends, it ends after like 3-5 seconds.
2. The buggiest issue I am having, is my computer refusing to be the "actual" screen. What I mean by this is that if I screen capture my desktop, the lower maybe 1/6th of the bottom and the right side is cut off, the resolution being weird.
I.E If i stream, and capture a window, and my mouse is in the middle ON MY SCREEN, the stream will show my mouse cursor to the right and a bit below of where it should be in the middle.

Please help me, as I've already tried my laptop brand's customer service GIGABYTE, and Reddit, but to no avail, and GIGABYTE takes forever for them to respond to tickets, and all they ask for is if i installed anything, etc when I got the laptop, when the issue was from the beginning.

What I have tried:
Disable/Enabling NVIDIA/INTEL HD graphics cards
System Reformat
Updating drivers
Change resolution

Thank you for your time, and I pray that someone has a solution for me... this is extremely annoying :(