I built a desktop PC last year and experience the same thing. Whenever CPU usage kicks up, it has this static noise. After replacing the motherboard, the noise went away. You might want to get it replaced.
I have been running Windows 10 preview for months and had it updated to build 10240 a few days ago. Today, after I "reset" it to clean, it booted up with blue screen showing INACCESSIBLE_BOOT_DEVICE.
I have tried to boot from USB but it just won't do it:
* Disabled APM
* Disabled Secure Boot...