Screen Sharing: remote Mac goes all black (even "in person") and needs power-down?

Discussion in 'macOS' started by nagromme, Jul 5, 2009.

  1. nagromme macrumors G5


    May 2, 2002
    I VNC to my iMac all the time (usually from iPhone with Jaadu, sometimes from another Mac with Leopard's Screen Sharing function: Connect to Server vnc://....)

    But lately it only works for a couple of days. After that, the remote computer's screen goes black and accepts no input. (But I can see/move the mouse cursor.)

    Once I get home from whatever trip I'm on, I then see that it's the same in person: all-black, no response to clicks or keys. I can move the mouse but I can't do anything at all. There's no solution except to force power-down.

    For security, I run the "Computer Name" screensaver with password lock. The first time the black screen appears I see just a flash of the password dialog and then it's gone. After that, I never see anything but black (and the mouse arrow).

    The remote computer is NOT crashed, because it accepts the VNC connection request and password, and because it keeps churning out work from Folding@Home (which I can see on my stats page).

    But after a day or two away (maybe one VNC session per day) the screen and input are gone. Anyone else see this? Any suggestions?

    (The only two changes made to that system lately: a new version of EyeTV software--but it's not recording or anything. And the 10.5.7 update. I'm guessing it's something new to do with 10.5.7.)
  2. nagromme thread starter macrumors G5


    May 2, 2002

    Now I have a new theory: one other thing DID change on the Mac recently... summer arrived!

    I've noticed some lines of colored noises on my screen--a symptom of GPU overheating. Sounds like a probable cause of other issues as well. It WAS pretty hot in the room lately.

    The lines went away when I cooled the air. Hopefully the VNC issues will be solved too.

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