HT201581: Find your Mac's serial number in About This Mac or System Information
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Q: all of a sudden my display is showing multiple screens and I can't get out of it unless I shut down manually- once the multiple sc ... all of a sudden my display is showing multiple screens and I can't get out of it unless I shut down manually- once the multiple screens start it looks like a swooch like a deck of cards mirroring same screen. what do i do??? is this a video card issue? more
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May 13, 2013 11:36 AM in response to Lillyinkby WZZZ,What happens if you Safe Boot? Shift key down at the startup chime and expect a much longer time to boot.