Cannot get to install Mac OS 9 on flashed Yosemite

[bengi3]

I flashed this G3 B&W and installed a G4 processor, adjusted the jumpers for the new bus/frequency combination and now it runs OS X 10.4 decently, but I cannot get to install any classic Mac OS.

Should I go back to G3 for this?

 

[bengi3]

Removed HD and ZIP, and all PCI cards, put back the G3 processor: no way. It boots fine with OS X Tiger but not with any Mac OS Classic. I even installed an universal Mac OS 9.2.2 from another Mac to an IDE HD and put as the only device in the G3: doesn’t boot.

 

[bengi3]

Removed everything, CD, ZIP, replaced CD drive, removed all Ram sticks except one, moved the video card to the farthest slot, installed a new HD: bingo!

Don’t ask me what was the cause! I went the straight way: