2013 Mac Pro DisplayPort Monitor does not wake from Sleep.

On my 2013 MP I have dual monitors:

One connected DVI-to-MiniDisplayPort a ViewSonic 24"

Second connected DisplayPort-to-MiniDisplayPort a MonoPrice 27" 2560x1440

When the computer comes out of Sleep or Off the 27" display does not come out of Sleep Mode.

If I unplug and replug the MiniDisplayPort connection from the MP the Display will turn on correctly.

Never had this issue with the 24" both monitors go into a sleep/hibernate mode(yellow power light on displays) when the computer turns off or goes to sleep.

When the computer comes out of sleep the 27" backlight turns on briefly but then goes back into sleep mode.

Troubleshooting: PRAM Reset and alternative ports on the MacPro with no luck.

Any thoughts??

Thanks in advance.