Re: plants vx zombies won't open - black screen
Possibly open up your Catalyst Control Center, go to Advanced view.
Under 3D Settings // 3D Properties, default them.
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Alternatively, uninstall CCC from Control Panel.
Run Display Driver Uninstaller in Safe Mode and clean AMD drivers.
Restart and installed latest
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Another thing to test.
Disable Origin in Game from the Origin Client.
This game needs it for certain things (like the original I assume).
If that allows it to launch... check around your running programs you may have another overlay program interfering (like Fraps, RiviaTuner, overwolf, etc). Origin in Game and other overlay software do not get along and OiG is pretty much required I believe for this title (not sure to what extent yet but I'd assume inviting and the store).