how to boot from cd or dvd

[ip2op01]

hi friends

am a newbie . Sorry for my english.

 

my system specification

motherboard - Asus P5N-e sli

Ram - 2gb

Lite on DVD righter

160 gb ata hard disk

 

i have installed leopard 10.5.2 on my PC .

 

i can boot from leopard install dvd.

but i can't boot from other bootable DVDs like tech tools 4 etc.

 

may be because using os x on a PC .

 

I have tried using F8 key but failed to boot from dvd.

I have tried using startup disk but no luck.

i have tried Pressing c and option key at startup but it does not work at all.

after pressing these keys my system stops at darwin loader and there is only on option to go and its a hard disk partition.

 

So please help me.

 

and tell me if there is any way to boot from dvds for PCs

 

also tell me if there is any darwin command to boot from dvd

i found that there is Mach_kernel file in bootable dvd so if its a bootable file then tell me how to open it from darwin.

 

Thank You.