Randomly makes "USB 'in and 'out'" sounds, screen flashes black

- Firstly my laptop was making the USB in and out sounds along with black screen flashes and also screen resolution changes.

- So I decided it was time to reset my laptop completely in the hope of fixing this problem.

- Now, after my laptop finished resetting, another problem has arisen, a red cross appeared on my speaker logo on taskbar and no sound ! So I fixed it following these steps windows 10 sound problem,no speakers or headphones plugged in error - YouTube (for reference)

- Now after this, yes, I have sound, but my sound quality has drastically decreased, almost like 'stock' sound. Unsure what to do now with this !!

- Further to this whilst avast free antivirus was installing (doubt that matters) my original "USB in and out sound" problem had happened again, with black screen flashes and screen resolution changes.

- As I had been in such a pickle I decided to come here as I really need an expert opinion.

My laptop is a HP Envy
Processor: AMD A10-5750M APU with Radeon(tm) HD Graphics 2.50GHz
Ram: 8gb

AN IMPORTANT NOTE: I upgraded to windows 10 as part of the free upgrade a while back. I noticed that the red cross speaker problem has been linked to this? Unsure for me.

Only things Ive got back on my laptop was google chrome (logged in again with all extenstions and bookmarks..etc).
Steam. Football manager 2017. and yes avast.

Any help greatly appreciated and thank you in advance.

Try to uninstall Avast and see if the sounds disappear as it is possible it's the cause of it. Windows probably installed generic drivers for your sound so go to the manufacturer website and download the correct drivers for your machine. I fact you should use the drivers from the manufacturer for other hardware such as your graphics and also run an Admin cmd command: sfc /scannow to see if any files are corrupted. Instead of Avast use the built in Defender and the firewall and with Malwarebytes free and common sense you'll be protected