Am running HD7700 Software 16.9.2. Monitor loses connection to HD7700, screen goes black on a somewhat random basis. Given I no longer have visibility on the screen I am forced into a power down. Sometime the monitor connects and returns sometimes it does not. I have replaced the HDMI cable. I think there may be a problem on the graphics board and I am looking for a diagnostic utility to eliminate the HD7700 as the source of the problem. Any ideas if such a utility exists?