Re: "Core Audio Technology" - still operating?

Does anyone know if  this company is still operating? I bought a modded mac-mini w power supply (approx $4k) in March 2015. I have been  asking for warranty repair (power supply whines audibly, mac power cycles on its own every few minutes, sometimes every few hours). Trying to resolve this since October.

I am having trouble getting a response from Ryan Mizner at Core Audio Tech.

Any advice?

thanks, Rickvan09