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iMac 5k Display Resolution Issues

I got a brand new iMac 5k.  All bells and whistles.  On initial install I told it to restore from Time Capsule Backup and then aborted that and did install new.  I only mention that in case it messed up some stuff in that.

When I go into System Preferences->Displays the default screen resolution is 2560x1440 and the MAX is 3200x1800.  No options anywhere for 5k (5120x2880).  I don't get what is going on.  I re-installed MAC OS X (using command-R) and having same issue, 

I also reset PRM using the option/command/p/r.

Anyone get this?  Its almost as if the drivers for the display are hosed.

Confused about scaling on 5k iMac

Apple>About This Mac>More Info>Service

Please read the warranty paperwork that came w/your computer.

You have 14 days to return the computer w/no questions asked. 

You have 90 days of FREE phone tech support on top of your standard 1 year warranty unless you also purchased AppleCare which gives you an additional 2 years of coverage plus FREE phone support.

Strongly suggest that you take FULL advantage of the above before it runs out.  Let Apple deal w/the problems.

Confused about scaling on 5k iMac

To have access to 5k resolution, you just need to press the ctrl key while clicking the "scaled" button.
it will look like this:

I tried to do this by holding down the "control" key and it didn't work. What worked was holding down the "option" key.

Thanks!

最後更新：2017-08-25 12:05:58

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