Wake up problem in SL with external display?

Discussion in 'MacBook Pro' started by Baggy Spandex, Sep 1, 2009.

  1. Baggy Spandex macrumors 6502

    Baggy Spandex

    May 23, 2009
    Hello all,

    Just did an upgrade from Leopard to Snow Leopard on my 09 MBP. I always use this computer in conjunction with my NEC display. On Leopard, I would keep the MBP lid closed and use the mouse or keyboard to wake it up, using only the NEC monitor. Now in SL, whenever I try to wake it up the screen flashes for a second and the computer goes back to sleep. Is there a setting or something I'm missing, or simply a bug?

    Really frustrating, as it's rendering it nearly impossible to use an external display. Everything else in SL so far has been great (knock on wood)

  2. BigJohno macrumors 65816

    Jan 1, 2007
    San Francisco
    is the power cord plugged in? I know I tried running my external with SL without the power cord and It would do the same thing. Turn on for a sec then go back to sleep.
  3. Baggy Spandex thread starter macrumors 6502

    Baggy Spandex

    May 23, 2009
    Thanks for the reply...power cord was plugged in the whole time. I did a resett on the SMC settings, and now it seems to be functioning properly. I'll be keeping an eye on it though.
  4. kasakka macrumors 68020

    Oct 25, 2008
    I had this problem when running on battery but once I connected the power cord it has worked just fine the whole day.

    Is it supposed to go back to sleep if not using the power cord? I think not?

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