I have an ubuntu usb that I want to install on two optiplex cpus, a GX-520 and a 755.
The usb boots on the 520 but not on the 755.
The 755 always goes to the hard drive.
The 520 has bios version A11 (11/30/2006) and the 755 has bios version A04 (11/5/2007)
Both machines have the USB / CD first in the boot priority list.
Both machines will boot from a CD but only the 520 from a USB.
Help?