I have a HP Pavilion 500-467c with AMD A8-6410 APU with AMD Radeon R5 running Windows 7 32-bit. I am trying to connect a SIIG USB 2.0 external graphics card, it says it's working but I can't get second display. The option to extend the screen is not even available in screen resolution. Both screens are VGA. Is there something on the R5 itself that needs to be enabled?