My newly acquired Power Mac 7,3 (2x 2 GHz, 2,5 GB ram) won't boot MorphOS using either USB or CD, any tips?

Booting via CD (via OpenFirmware) gives me:

LOAD-SIZE is to small

Booting via CD and using "C" during boot just ejects the CD after some reading noise..

Booting via USB using the following commands

boot usb2/disk@2:,\boot.img bi umsd0:morphos.iso

Loading ELF

DO-QUIESCE finished_

And then nothing..

Any ideas?

CD getting ejected means that OpenFirmware was unable to load/read from it.
Nothing happening on USB boot... are you sure you've got a supported graphics card?

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No I'm not.. I guess not from reading the supported hardware list, it's a GeForce in it.

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So it likely boots all right, just cannot display anything :/