iMac won't read from USB or CD?!

hi guys.

have imac 20" powerpc g5 2.1ghz. have tiger disk when insert it, starts loading , grey circle line through (like road sign.) don't know else do? have tried usb have snow leopard on usb,

thank guys replies!

 

mac os x 10.6 snow leopard not install on mac, 10.6 intel macs , have powerpc mac, uses different architecture intel macs.
ppc macs not boot usb devices, unless 1 clones mac os x onto them.

tiger cd have, cd came mac or retail cd or grey restore cd mac?

 

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