Have Gateway - DX4200-09, Windows 10 Home , AMD Phenom 9750 Quad-Core Processor, and ATI Radeon HD 3200 Integrated Graphics. The HDMI port does not work and I am using the RGB port currently. What graphics card should I get to replace the 3200. Would like to use the HDMI for my monitor. How would the new one be installed and the integrated one turned off??