An alternate power source could be a different AC Adapter (if you have one), a backup battery (again, if you have one). Sometimes having the AC cord plugged into a surge protector, where a fluorescent lamp is plugged in can get some audible feedback. You should try different wall outlets as well.
Restarting your computer is a valuable troubleshooting step, I recommend you try it if you haven't.
To ensure the microphone is muted, see the section "Microphone or line-in device is not working with the computer / Step 2" in this document: Resolving Microphone and Line-in Problems (Windows 8)
If those steps do not improve the situation, you can restore the original audio drivers using this document: Using Recovery Manager to Restore Software and Drivers (Windows 8)
After that, install the updated drivers located here: IDT High-Definition (HD) Audio Driver
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Re: Pavilion Touchsmart - when playing video i am getting a buzzing sound and lag.
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