If it's making that kind of noise, I would return it if where you purchased it they have a return policy (30 days usually) and you're still within that window.
If not, someone from Intel should come on board with more information for you. Hang in there !
I have the exact same unit going on 2 months without issues...so far
Thanks for the response. You don't think it has anything to with the kind of OS (ubuntu) I am trying to boot up with?
Or HDMI-adapter I am using?
I am afraid that even if I get a replacement unit, it will be the same. And THEN it will be hard to convince the retailer of "undoing" the purchase.
Your unit; are you running Windows on it?
Unfortunately it hasn't been going all that well. The problem is still there. I have been in contact with Intels support and we've been trying different things. Now the only thing that remains is returning it. I doubt that I will replace it because I don't trust the product (meaning I don't believe it's only a defect copy I've gotten).
I returned the device recently. But not before I figured out that the issue was probably with the sound drivers for the new Nuc (even the sound card is a brand new model for the series). Why do I say that? Well, because of 3 reasons:
1. I adjusted the volume on the TV (I don't have a TV-signal and use external speakers so the TV-volume doesn't affect anything normally, so that is why I hadn't thought of it) and the exploding sound turned to a whimper. Up until that point I always plugged in either my headphones to the NUC's 3.5 mm port or my external speakers. I never tried without, to see if the HDMI cable would deliver sound on its own. BUT despite me muting the sound with the mute button the whimper was still there... Logically, if the exploding sound was lowered by me lowering the volume, it should have disappeared completely when the sound was muted, but strangely it didn't.
2. It turns out that the HDMI doesn't carry sound to the TV as it should. There is no audio at all if I don't plug in headphones or external speakers. And yes; I did try another HDMI-cable and HDMI-port on the TV with the same results.
3. I tried an older NUC model (DN2820FYKH) and it worked fine. I put on a youtube video and the sound came out beautifully through the HDMI and in to the TV-speakers, without any external speakers or headphones.
So my conclusion is that the audio drivers through HDMI is not working (despite me upgrading to Ubuntu 15.04 and got some other issues solved as displayed in this thread). It works fine through external speakers and headphones though.
Does this make any sense to some technical person out there? If so, mind explaining it?