i’ve installed debian stretch on an old dell poweredge 2950. after booting it i saw grub, few lines from kernel and then green screen with “out of range”:
reboot, on the grub menu select “*Debian GNU/Linux”, press e, hilight a line with linux /boot/vmlinuz-4.9.0-3-amd64 root=/dev/sda1 ro quiet, add there vga=normal fb=false nomodeset and press ctrl+x
once i booted i edited /etc/default/grub and added GRUB_CMDLINE_LINUX=”vga=normal fb=false nomodeset”, then run update-grub ; reboot