It seems like you are facing an issue with setting up dual monitors after reinstalling Windows 7 and the ATI Catalyst Manager. Here are some steps you can take to troubleshoot and resolve this problem: 1. Check Physical Connections: - Make sure both monitors are properly connected to the graphics card on your computer. Ensure that the cables are securely attached to both the monitors and the graphics card ports. 2. Update Graphics Drivers: - Ensure that you have the latest graphics drivers installed for your ATI graphics card. Sometimes, outdated drivers can cause issues with multiple monitors. 3. ATI Catalyst Control Center: - Open the ATI Catalyst Control Center and check for any settings related to multiple displays. You may need to configure the dual monitor setup from within the Catalyst Control Center. 4. Windows Display Settings: - Sometimes, Windows may not automatically detect the second monitor. You can try to manually detect the second monitor in Windows settings: - Right-click on the desktop and select "Screen Resolution." - Click on the "Detect" button to check for connected monitors. - If the second monitor is detected, you should see it listed in the display settings. 5. Extend Display: - Once the second monitor is detected, you can choose how you want to use the displays. To extend the display: - In the Display Settings, select the second monitor. - Under the "Multiple displays" dropdown, choose "Extend these displays." 6. Restart Your Computer: - Sometimes, a simple restart can help resolve issues with display settings. Restart your computer after making any changes to see if the dual monitor setup works correctly. 7. Check Monitor Settings: - Ensure that both monitors are powered on and set to the correct input source. Some monitors have multiple input sources, so make sure they are set to the correct one. 8. Test with Different Cables: - If possible, try using different cables to connect the monitors to rule out any issues with the cables. 9. Check Graphics Card Compatibility: - Ensure that your ATI graphics card supports dual monitors. Some older graphics cards may have limitations on the number of displays they can support simultaneously. By following these steps, you should be able to troubleshoot and set up your dual monitor configuration successfully. If the issue persists, you may need to check for any specific compatibility issues between your graphics card, drivers, and Windows 7 setup.