2012 MBP - very slow screen appearance at start up

Discussion in 'MacBook Pro' started by planemechanic, Jul 22, 2017.

  1. planemechanic macrumors newbie

    May 27, 2010
    My 2012 MBP screen is acting up. It can take as long as 15-20 minutes before the screen appears. I know the laptop is working because I can see the password screen on a second monitor. Any ideas? TIA
  2. Audit13 macrumors 68040


    Apr 19, 2017
    Toronto, Ontario, Canada
    Possible virus? If it's a mid-2012, could be a bad hard drive cable. Failing drive?
  3. planemechanic thread starter macrumors newbie

    May 27, 2010
    I ran three different virus checkers, and I have a 1tb SSD installed. The computer is on, as I mentioned I can see it boot up on an external monitor, but the screen attached to the laptop is black. It eventually comes on, then will work for days or weeks if I don't reboot.
  4. DeltaMac macrumors G3


    Jul 30, 2003
    15 or 20 minutes before the screen appears?
    Every time?
    Have you tried both hardware resets (PRAM, and SMC resets)
    Do you normally keep a monitor attached (so you have a second display), or did you just try that as part of your testing?
    On that long wait, try shining a bright light/flashlight into the screen, to see if there are any icons or menus, or the dock visible (or just the login screen). Maybe it's just the backlight not working properly.
    This can be the display panel, or the logic board. My bet would be on the LCD panel.
  5. ZapNZs macrumors 68020


    Jan 23, 2017
    Does this behavior happen when you disconnect all cables from the MBP?
    Does this behavior happen only on startup, or also when coming out of sleep or hibernate modes?

    Has the PRAM/SMC reset, Apple Diagnostics, starting into safe mode, and/or a OSX reinstall been attempted already?
  6. Fishrrman macrumors G5


    Feb 20, 2009
    I'd suspect the ribbon drive connecting cable inside.
    Cheap and easy fix.
  7. planemechanic thread starter macrumors newbie

    May 27, 2010
    I doubt it is a ribbon cable, as the display comes on and will stay working for days or weeks, until I reboot.
  8. planemechanic thread starter macrumors newbie

    May 27, 2010
    One added issue, the slow screen appearance is not just at start up, it happens sometimes when waking from Sleep.

Share This Page