I have a Dell inspiron N7110. I installed Zorin 17.2 and on reboot I gen a message " No system found. This machine is a legacy version, no UEFI. It is set for compatibility mode and has the latest BIOS. I have tried multiple times. Previously I hade Linux Mint 21.2 and it worked fine. I reinstalled Mint 21.2 and it still works. I did have to install Mint 18 first then 21.2. I have gone through everything and am not finding answers.
So from a quick google this appears to be an older dual core laptop, if my search is correct? I'd wager that you're using BIOS and not UEFI, and that that message is confirming that. How did you make the USB drive?
I would recommend a tool like Rufus in this scenario so that you can select most likely an MBR partition scheme as well as BIOS rather than UEFI for the boot method. That's from what I can see in your post, anyway.
Rufus didn’t work. Still no system found. As a check, I reinstalled Mint. Then started up the zorin install again and it sees there is a mint version there. The only option is to overwrite it completely. Mint on the other hand allows the boot to be undisturbed and a new system replacing the old. Zorin doesn’t have this.
That is strange. I thought it allowed to install alongside whatever is present. I your machine uses mbr method you need to be aware that you re limited to 4 Primary partitions. Notebooks are notorious for having 4 Primary partitions comprising of Drivers partition at start, then C:\ partition that holds Windows, then factory reset partition and lastly, media creator for re-installation. I have had no issues installing Zorin 17 using Ventoy.
That will completely wipe Your Disk and install Zorin. And when you used Rufus: did You checked that under ''Partition Sheme'' MBR is chosen? Look here: