adding reboot=b Fixed it for me on my Optiplex 745, 755, GX620 using Kernels: 2.6.24-19 2.6.24-20 2.6.24-21 Ubuntu Version 8.04 this issue was non existent on 7.10 however 7.10 did not have good driver support for the Optiplex 755
Menu.lst:
title Administrator Tools root (hd0,4) kernel /boot/vmlinuz-2.6.24-20-generic root=/dev/sda5 ro quiet reboot=b initrd /boot/initrd.img-2.6.24-20-generic quiet
adding reboot=b Fixed it for me on my Optiplex 745, 755, GX620
using Kernels:
2.6.24-19
2.6.24-20
2.6.24-21
Ubuntu Version 8.04 this issue was non existent on 7.10 however 7.10 did not have good driver support for the Optiplex 755
Menu.lst:
title Administrator Tools 2.6.24- 20-generic root=/dev/sda5 ro quiet reboot=b img-2.6. 24-20-generic
root (hd0,4)
kernel /boot/vmlinuz-
initrd /boot/initrd.
quiet