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Mac Mini (2012) HDMI losing sync (blank screen/snow)

80636 Views 429 Replies Latest reply: Jan 28, 2014 11:51 AM by jurre-j RSS
  • SlipDragon Calculating status...

    Michaelk5, what is the source for your quote?  I'd like to use it in my appointment with Apple on Saturday.

  • n13ldo Calculating status...

    Decided my Mini is going back. Purchased on 2nd November '12.

     

    Apple website wouldn't allow a return even though the holiday return window is open (27 October to 25 December). Had to call them and pointed out the website statement to this effect:

    http://store.apple.com/uk/help/returns_refund

     

    Intel integrated grahics really do suck. Lesson learned. Time to start saving for something with meaty GPU inside.

  • John_Ri Calculating status...
    Currently Being Moderated
    Dec 7, 2012 10:03 AM (in response to .Bunny)

    Hi

     

    Like many others I was experiencing flickering (so now and then, about 2 seconds) and/or coloured snow on my Mac Mini 2012 i7, connected to HDMI. Luckily my monitor (HP LP2475w) has a display port. I bought a mini-DP to DP cable (€ 14.00) and connected my monitor to the DP, which solved the problem.

     

    When connecting a second monitor (to the HDMI port) this does not effect the good working of the HP LP2475w connected to the DP. However the flickering and snow is much worse on the second monitor, than it was when only a single monitor was connected to HDMI. After some time the snowing even remains until I unplug and plugin the monitor again. Morover, the Mac Mini gets very warm then. Therefore I now work with one monitor again, on the DP.

    I thought this info could be useful. Maybe a question of overload?

     

    Best regards,

    John

  • alberto.benamu Calculating status...
    Currently Being Moderated
    Dec 7, 2012 10:24 AM (in response to .Bunny)

    I am not having the flickering /snow anymore, what I did was applied the 10.8.2 supplement 2 package and it fixed it, my monitor is quite responsive and all BUT, I still have a problem when restarting my mac mini, my monitor loses the signal and will not bring it back no matter what I do until I have to force restart pressing the power button, then the monitor picks up signal from the HDMI port and I can see a full restart process. Perhaps I am wondering if I am not seeing the mac mini restart correctly is because I do not hear the booting sound, maybe that is why the monitor will not get a signal thru HDMI.

  • MyMac8MyPC Level 4 Level 4 (1,440 points)

    alberto.benamu wrote:

     

    I still have a problem when restarting my mac mini, my monitor loses the signal and will not bring it back no matter what I do until I have to force restart pressing the power button

    Really glad that you are not seeing the flickering problem Alberto. Regarding the restarting problem, does your keyboard have a remote power button (so you can restart the mini via the keyboard)? There are some things that you can try, but you'll first need the appropriate keyboard to try them. It sounds like you're having HDMI handshake issues. Also you can adjust the volume of your boot chime if you need to. See THIS article for instructions. Hope that helps.

  • alberto.benamu Level 1 Level 1 (0 points)

    My keyboard and mouse are not apple, they are Logitech. I am not sure about HDMI issues, as my mac mini not shutting down or restarting properly.

  • MyMac8MyPC Level 4 Level 4 (1,440 points)

    alberto.benamu wrote:

     

    My keyboard and mouse are not apple, they are Logitech.

    It's not an Apple feature. My keyboard is also Logitech and it has the power button. Regarding the other issues, have you tried repairing Disk Permissions? That has been know to help shutting down and reboot issues.

  • alberto.benamu Level 1 Level 1 (0 points)

    You are right, I have a power button, how on earth could I miss that? I have fixed permissions and will do again and see if I have a successful restart with chime and all.

  • MyMac8MyPC Level 4 Level 4 (1,440 points)

    alberto.benamu wrote:

     

    You are right, I have a power button, how on earth could I miss that? I have fixed permissions and will do again and see if I have a successful restart with chime and all.

    If your sound is running through HDMI then you might not hear the chime because it will be muted. Just give it around two minutes to reboot without touching anything. See if it comes to the password screen. If it does then you're golden. If it doesn't then try clicking the remote power button and choose sleep. Once it's in sleep mode tap your spacebar or move the mouse around to wake the computer. The HDMI handshake should work this time and your password screen should (at this time) be visible. Hope it works out for you

  • alberto.benamu Level 1 Level 1 (0 points)

    I have sound thru toslink. Will try what you suggest, right now.. Will report once I am back.

    Thanks.

  • MyMac8MyPC Level 4 Level 4 (1,440 points)

    alberto.benamu wrote:

     

    I have sound thru toslink.

    That may also mute your chime if it's selected in the Sound > Output section.

  • alberto.benamu Level 1 Level 1 (0 points)

    Well as you said I do not hear the chime, also my mac is not restarting as it should. Could it be that I have several peripherals connected thru USB. I have not tried restarting with only keyboard and mouse connected yet.

  • SlipDragon Level 1 Level 1 (5 points)

    Just had my second call with Apple Support (+353 21 238 0596).  They claimed not to have any knowledge of this this problem.  I told them I wanted to keep the fault ticket open but wait for a while to see if a fix is released.  In the mean time I have bought a cheap Thunderbolt-DVI adaptor and everything is working okay.

  • michaelk5 Calculating status...

    My Mac Mini went back yesterday because there is no timeline on the fix, although apparently Apple says the fix is software (firmware), so if you can hold out the patch will come via Software Updates

  • takonop Calculating status...

    I have experienced this issue as well. I just purchased the 2012 Mac Mini i5 model about a week ago from my local apple retailer. Since having it, my display has gone black 2-3 times. It only lasts for a split second. The display goes back and then resumes exactly where it left off with no other apparent effects. I am using a 23" AOC i2367fh display, and I am running HDMI to HDMI.

     

    I contact Apple Support and was called within 2-3 minutes, and the experience was surprisingly pleasant. The rep said that this issue has been reported and is being investigated.

     

    He gave me a case number as well - 383059530. If you are experiencing this problem, reference this case number.

     

    I didn't really get an answer other than, "...keep checking for updates."

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