How to boot from rescue disk

Hi,
I am running Macbook Pro, snow leopard 10.6.8
My resuce disk is based on 10.6.4
I tried to boot from rescue disk to repair the main disk.
I failed to boot from the rescue disk as my rescue disk (from CD) is not being recognized. I tried multiple options such as holding down "C", "c", "option" key etc while the system is restarting. Only the main disk was being shown as the bootable option (while holding down the option key when restarting) but not the rescue disk.
I verified that my rescue disk is good. Infact, I could boot a Lion MacBookPro using my resue disk.
Any inputs are appreciated.
Thanks
gb

It was 10.6.4 (Snow Leopard). It was the same as the rescue disk version.
thanks
gb

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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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http://www.cisco.com/en/US/docs/unified_computing/ucs/sw/gui/config/guide/2.1/b_UCSM_GUI_Configuration_Guide_2_1_chapter_011110.html#d180135e3777a1635
------------ snip --------------
Maximum of One RAID Volume and One RAID Controller in Integrated Rack-Mount Servers
A rack-mount server that has been integrated with Cisco UCS Manager can have a maximum of one RAID volume irrespective of how many hard drives are present on the server.
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http://www.macmaps.com/badram.html
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