facing a problem to boot compaq prolient server from cd rom

[Mohammad Mustaqeem]

hi,
first i install linux from cd rom of compaq prolient 5600 series server. after installation i disable cd rom from bios.
now hard drive is on first boot drive and cd rom is disable. i try so many times to inter in bios but unable to enter.
i use following key's to enter in bios
Esc
F1
F2
F4
F10
Ctrl-Del
Del

but all in vain.i want to boot system from cd romm and do fresh installation. but from last 1 week unable to in bios.