Make sure your power supply unit (PSU) has enough wattage to handle the power requirements of your graphics card and all 6 monitors.
How to get 6 monitors with extended screen
Dave Schultz
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Graphics adapter is AMD 7750 with 6 ports running on a custom built machine non virtual. Windows detects all 6 monitors and I can extend the desktop to only 4. Monitors 5 and 6 remain black but show they are detected. When trying to extend an error occurs. I have tried extending and duplicating monitors to no avail. I have spoke with a tech from AMD and they suggest a windows issue. I have two of these 7750 adapters on identical computers and both act the same. This setup is for business use to display a different graph on each monitor.