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

-- 
dell xps 410n won't reboot - regression
https://bugs.launchpad.net/bugs/213754
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