I've seen a couple of these asked already, but none of the solutions fixed my issue.
2 x Viewsonic VX2250 monitors, hookup up via DVI
I had dual monitors in Windows 8.1 with exact same hardware. I still see both monitors in clone mode when booting, but the second monitor turns off at the windows login page. The 2nd monitor doesn't show in the windows display settings page, nor the Catalyst page, only showing "detection complete" after finding only the 1st monitor.
I've tried the win10/64 Catalyst driver set, Win 8/64, and the Win7/64 one. I've used the cleaner uninstall utility. Whats the deal, is there something different about the dual monitor setup in Win10 vs 8.1 ?