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My external monitor flashes random colors after waking up from sleep?

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Post time: 2014-02-15 12:24:24 |Show all posts
Displays
Whenever I wake up my Mac Mini, the monitor flashes thru many different colors..... red, blue, greeen..... maybe some other ones. Sometimes it does this for a few seconds and then gets to the log in screeen and sometimes it does if for 30 seconds or longer. I have a Samsung Monitor hooked up via HDMI cable. I have had this computer for close to a year and it only started doing this over the last month. Once I can log in I don't seem to have any performance issues, I'm just woried it will get worse over time..... Maybe never stop flashing.
        Mac mini, Mac OS X (10.7.5), I am using a Samsung monitor/HDMI
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Post time: 2014-02-15 13:39:43 |Show all posts
Hi, installed any software/updates in the last month?
I wonder if it's a variation of this, of which I've seen many different symptoms...
Resolution
Move the mouse or trackpad cursor over the center area of the login window so you can see the user icons. Click on the icon of the user that you would like to login as, type in the user's password, and press Return.
If the login window is configured to show only the name and password fields, type in the user's name and password into the fields, and press Return (even if you cannot see the rest of the login window).
Additional Information
This issue will not occur if the display is not sleeping when the account is logged out. Use the steps below to confirm that the account is not configured to log out automatically while the display is sleeping:
[ol]
  • Open System Preferences > Security & Privacy > General. Click the padlock to unlock the preference pane and enter your admin password. Click the Advanced button at the bottom, then see if the option "Log out after N minutes of inactivity" (where N is the number of minutes) is enabled.
  • Open System Preferences > Energy Saver and configure Display Sleep to occur after the account is logged out, by dragging the slider to a number of minutes that is greater than N was set to in the previous step.[/ol]Important: If automatic log out is not needed, disable "Log out after Nminutes of inactivity" in System Preferences > Security & Privacy > General. This will also prevent the issue.
    http://support.apple.com/kb/TS4135?viewlocale=en_US
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