I've also had this: https://apple.stackexchange.com/questions/132351/does-os-10-9-3-work-with-multiple-external-4k-monitors?atw=1 https://apple.stackexchange.co

I've also had this: https://apple.stackexchange.com/questions/132351/does-os-10-9-3-work-with-multiple-external-4k-monitors?atw=1 https://apple.stackexchange.com/questions/132351/does-os-10-...