ibook G4 help


sorry double post, posted in macbook forum accidentally (could mod delete one?). here's post:

ok, bizarre case; i'll preface saying i've worked on over dozen g4 ibooks, including own (which works fine). here's case:

working ibook when received replace optical drive.
replaced optical drive, replaced no damage , parts connected correctly.
after repair, ibook not book (flashing folder/question mark).
booted firewire mode, g5 (diagnostic machine) wouldn't identify computer.
tried booting osx install disc; 3 times apple logo shifted right , down artifacts in space moved from, 1 time crossed out circle replaced apple logo.
tried booting hardware test disc different ibook, got "does not support ibook" shut down/restart menu.
removed added ram , airport card; same symptoms.
though didn't touch hdd cables, took apart again check cables.
symptoms persist.

@ now. thoughts? ideas? next step go original optical drive, doesn't make sense me, when in doubt, original. if has advice, please supply, stumped...
 

i think might know problem is. know it's not cables, nor optical drive - bet it's slave/master/cable select setting that's goofing things up. if putting original optical drive in makes work, add further weight theory. ibook expects settings way, , when they're changed, sorts of weird problems occur, such ones describe.
 


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