Im no expert but as you have switched from nvidia to ati its possible some of the old nvidia driver is lingering on your pc and causing the issue.
Download display driver uninstaller.
Uninstall your ati driver through programs and features.
Boot in to safe mode and run display driver uninstaller for both nvidia and ati. DDU should also change a windows setting to stop windows from updating your display driver automatically.
Reboot in to windows and install the new ati driver.
If this doesnt work try updating your motherboard bios.
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