Just a "me too" data point. I have had my video via HDMI-to-DVI on my new mid-tier mini blink out more than a few times, and I did see brief static once. It is more rare for me than some of the other reports.
The funny thing is that my usage at the times I noticed the interruption made me think it might have something to do with power saving/idle monitoring. On every occassion that it went out, I noticed that I hadn't been using the mouse for a while, as though my typing alone wasn't enough to keep my display awake, but the Mac figured out it wasn't idle just after the display was shut off, so it turned it right back on.
Maybe the problem is completely unrelated to user activity, but that's how it seemed to play out every time it happened to me. For people who are seeing it more frequently, perhaps you could fiddle with the sleep in Energy Saver to see if turning it off helps in any way.
That's exactly my configuration, but pulling one of the DIMMs seems to have made all the difference. I haven't seen a problem since I pulled it on Saturday night.
I'm only using this as an HTPC server and client, so I (or one of my kids, or my wife) would definitely have noticed the hourly snow/blink/freeze. They've been home with it playing some video or music for much of the last few days.
I currently have all the sleep settings and screensaver turned off.
Next troubleshooting steps:
1) put the other memory module back and see if I can reproduce the original issue.
2) Turn monitor sleep back on and see if it makes any difference.
This seems like a sick place to be, but would it be a good idea to buy AppleCare for this in the event there ends up being a replacement program or some other fix they'll only extend to customers with AppleCare. I hate being extended warranties and never have bought AppleCare for any of these dozens of products for which they offer it. Never needed to before now.
I'm not so interested in returning it unless its for one that's confirmed to not have the issue. It works well enough at this point, but I would like to put all the RAM I bought for the dang thing in there at some point!
I'm definitely seeing a lot of Samsung monitors mentioned - and a sprinkling of Dell monitors. I wonder if this has anything to do with it, or is Samsung just that popular now? Seems like HDMI -> [converter or straight through] -> Samsung is a common theme. I think I'll try hooking mine up to another brand of monitor tonight.
Now I'm VERY unhappy with Apple. Telephone support told me to go to the Genius Bar and I just got out. I described the problem for a minute and the guy said he'd seen the problem before and was going to send the mini for repair. I said I wanted to return it instead and that telephone support said the Genius would take care of the return and refund. WRONG! The Genius said, "We don't take build-to-order returns in Canada in store. You'll have to call AppleCare and arrange for the return." Total appointment time, less than 3 minutes. Oh, and then there's the 40 minutes of freeway driving plus gas for nothing. If the guy on the phone was properly trained I'd have saved time and money.
No doubt I'll now have to wait for Apple to send a return box and then be home for pickup wasting even more time. Is this the kind of customer service that keeps Apple at the top of the satisfaction charts?
Same issue here as well,
I am running a Dell u2711 monitor over HDMI to DVI cable. The white noise has been observed specifically when switching between inputs on the display.
Does anyone know the spec of the HDMI port on the mini?
Also is this issue observed with the DisplayPort cable from the Mini straight to the monitor?
I thought I'd chime in and say that I'm getting the described behaviour as well on a late 2012 Mac Mini I purchased a little over a week ago from my local Apple store.
It happens on both a Samsung desktop monitor and a Dell desktop monitor (I switched monitors with another machine to test). Both were connected using the HDMI to DVI adapter that came with the Mini. When the "snow effect" happens, I just switch off the power to the Samsung or Dell monitor and when I turn them back on the snow effect is gone once the Mini re-discovers the display.
I hope this is something that Apple can fix with a software update rather than it being a hardware problem they cannot work around.
Folks, mine was doing the same thing with an Epson 5020UBe projector via HDMI. Blinking in and out non stop.
Even though my Mini came with the 10.8.2 update already installed, I installed this one over the top again and it fixed the issue!
Please give it a go and report back.
You may consider a cabling problem. I cite from the Macintouch forum:
It sounds like the HDCP (DRM) handshaking is failing -- I've seen the same thing happen on TVs with Blu-ray players. It's unlikely changing adapters will make a difference, because an HDMI-DVI adapter is purely passive. (Mini-DP->DVI/VGA, on the other hand, is a totally different beast, because it's telling the DP port to output a completely different kind of signal.) That said, the fix might be really simple and cheap: try different cables. If you're going to get new cables anyway, I suggest dispensing with adapters altogether, and instead going on monoprice.com (for budget) or bluejeanscable.com (for top quality with good prices) and ordering cables that have HDMI on one end and DVI on the other. And get cables that are the shortest possible. The DVI signal (which is what HDMI uses) is really quite feeble and doesn't handle long cable runs well, and the HDCP handshaking is even less forgiving.
One thing I forgot to mention is that in preparing for the return of the mini, I zeroed the drive and reinstalled Mountain Lion. The Thunderbolt port remains dead. I didn't wait to see if the HDMI port still blinked.
Got off the phone with Apple to arrange for a return. They gave me a link to print a return label for UPS and said it could take 5 days to return to the factory (to Synchreon in Vaughan, Ontario, Canada, not the shipping point in China). Then, it would take another 5-15 days to refund the money. My guess is I won't see it on this month's Visa bill.
Apple really needs to step up and say SOMETHING, even if it's "We're looking into it." To remain silent is not putting the customer first.
Initially I suffered the problem with the display just showing 'shash' this was on an Eizo ColorEdge CG223W connected by HDMI to DVI adapter.
That problem seemed to go away, may be after a system update, I then suffered these blackouts which would last a second or so.
My second monitor connected to the Mini by Mini Display Port to DVI has exhibited no problems.
I contacted Apple initially about the 'shash' and they sent me an app to generate a report which I then e-mailed back to them. A couple of days later I then e-mailed them to let them know about these blackouts.
Apple want to 'capture' my Mac Mini to carry out further investigations, so I have reinstalled OS X Mountain Lion after first erasing the disc of my apps and docs.
I now have to arrange collection using an Apple account number and send it back to Apple. When it arrives they will send me another one as a replacement. Not that they don't trust me or anything
Luckily I remembered to deauthorize my two Adobe applications I had installed or I would of had problems there when the new one arrived!
Lets hope the new one is better? Although I have my doubts.