my dvd drive doesnt work anymore lol how do i i nstall from externall hdd ?

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CPU: AMD Phenom 9600
Chipset: 790G SB700 (looking for the kext for it now)
Audio:Realtek ALC888
Lan: Realtek 8111C
Video:ATI Radeon HD 3200

unimportant stuff:
Ram: 4 x 1GB 240 pin ddr2 @ 1066mhz
Hdd: 40 gb (IDE) (FAT32)
250 gb (SATA) (NTSF)
External 1TB (HFS+)
External 250 GB (NTSF)
Audio interfaces: Mobile Pre, FW Solo, Lexicon Alpha, Motu, etc.
This whole rig is for production purposes

www.myspace.com/natewil