Question PC - sound output has static - extensive troubleshooting

[mitchel]

My 6 month old Dell was working fine and cranking out the tunes until a few weeks ago, now I get the occasional static / crackly / kind-of skipping and can't figure it out.
These are the things I already tried:

• Uninstalled and reinstalled all related drivers.
• All updates for Win10 and system drivers have been installed.
• Tried a different set of speakers/cables and it did not help.
• Tried various sources of music online and .wav files and the static remains.
• Tried different power cords...did not help.
• Disconnected the PC and connected my old Dell to make sure it's not a power problem in my office, the sound out of the old PC did not have static.
• Took the battery backup out of the equations and it did not help.
• I hooked up the speakers to the rear audio output, the front headphone output and the audio output from my monitor that is connected via HDMI and the static remains.
• Tried changing the audio quality / frequency response and it did not help.

Any advice? My guess is the Motherboard or Power Supply.

Seeing that this is my business PC, I have a full Warranty Plus Next Day Service, I just like to use Support as a last resort.

 

[rgd1101]

might be something else is interfering with it.
added any new components? wireless keyboard/mouse?

 

[mitchel]

might be something else is interfering with it.
added any new components? wireless keyboard/mouse?

Great questions...nothing new has been added to the PC or my Building that would cause interference (we don't deal with heavy machinery).
When I hooked up my old Dell, I used the same peripherals on it to make sure they were not causing the problem. No sound issues on the old PC.