Unable to run iso's

[larry29936]

I'm running Ventoy-1.0.44 installed on a known good USB (partition type GPT). I've copied 4 different Linux iso's and a Win10 iso to the USB. All iso's will boot in either UEFI or BIOS mode. When I boot from the USB I can see all of them, but when I select any of them all I see is a black screen. I even waited 10 minutes, nothing happens.

Does anyone have any idea what's going on?

Thanks in advance.