I'm trying to install Win 7 from a (know good working) USB flashdrive. The desktop is a USB Pavilion Slimline PC 400-314 with WIN 10 already on it. I've attempted to go into the Boot Menu (using Esc) to access the Boot Menu but I don't see the USB in there (see attached).
Also tried going into BIOS & have made USB Hdd the first but still no luck (see attached). It just boots normally into Win 10. Once in Win10, it see's the USB drive. I tried both the front & rear USB ports. I know the drive is good because because I just installed/booted from it yesterday on another machine.
I've also made sure all USB ports are enabled unless there is some setting preventing a boot from USB?
Any assistance appreciated. Thanks.