Hey, that’s a nice looking mini PC. Great specs for the price too! Like any Linux Distro, it runs on most x86_64 systems, but not all. Take a look at our known good hardware forum:
It is possible, there’s just something about that particular machine that is simply incompatible. But I’d try to rule out every other possibility first. I would be surprised if you don’t need the non-free image for that machine. So makes sure you are downloading the correct ISO. I’d also try a different flash drive, just to rule that out as a possible problem. Another thing I might try, is to attempt to install Debian on that machine just to see if that works. If Debian won’t work, you’re going to have a tough time getting StartOS to work, as it’s based on Debian.