"Input not supported" error while trying to install W10

I am trying to do a clean install of Windows 10 Home on a refurbished Dell OptiPlex 790 system. I am using a 1 Tb Western Digital HD on which I did a complete format before attempting to install from a purchased factory OEM CD.

To this point, I can't get far enough into the set up and installation to do anything within Windows, but I still get the bouncing gray box on a black screen with the "Input Not Supported" message.

I have tried changing the monitor setting from it's internal menu, but have not been able to find a setting that Windows seems to like.

Anyone have any suggestions...?

Thanks for the response, but I had already tried changing the resolution on the monitor before finally giving up and asking for help...

Must be VGA. There is an unused HDMI connector beside the standard monitor connection. I suppose I could try an HDMI connection before I get too crazy with anything else, but, to this point, when I boot up the system, the BIOS splash screen presents as does the Dell POST screen. It is only when the Windows 10 setup process begins that things go haywire.

JZiegler1953 said:

Thanks for the response, but I had already tried changing the resolution on the monitor before finally giving up and asking for help...

Try changing the resolution to a 4:3 format, like "800 x 600".

Ben

I solved the problem with a different monitor...

Thanks for your input...