Hi, sorry to see you have problems.Maybe we are looking at it the wrong way? some people have been able to install trisquel 6.
have you tried trisquel-mini? your bios settings seems to work for dvdrom but not usb? you have not tried to install to hdd but only tried to do live usb? if you are willing maybe you could do a recap? there are other free gnu/linux os. parabola and gnewsense for instance. trisquel is not the only one so you can try others. maybe that can help find the problem?
