Welcome aboard Blazer1878!

Now I wonder if it might have something to do with the ATX PSU — but that is just a guess. I’ve never attempted an MDD ATX conversion myself but I understand that many who have tried, often run into problems. Maybe someone here has done so successfully?

One member here, Greystash has done so using an ATX adapter cable:
https://mac-classic.com/articles/power-mac-g4-mdd-atx-conversion/
Plus: https://www.ebay.com/itm/143542889309
And for more info, he offers this link too: http://atxg4.com/mdd.html

You say that it does not affect OS 9 but that it will not boot any version of OS X?

I’d review Greystash’s comments and links… and maybe someone else here will also chime in.

It seems like it’s always a question of checking and then re-checking the wiring.

Perhaps you can place the PSU outside of the case long enough to place the DVD drive back into the case for a little while… which might allow you to boot from a diagnostic disc to check other “things”?

How much total RAM is installed?

Can you post detailed pictures, or diagrams of your ATX wiring?
Greystash (or someone else) might be able to detect possible problems.

*I reduced your image file sizes in original post.

Hello, I have g4 mdd that i got for free. I repasted it, replaced ram with one, that surely works and replaced psu with xilence 400w one that matches specs of og one with pins reseated to match pinout of original psu. After building everything together and booting os 9 using netboot, due to dvd drive being yoinked out to house psu i got error that one of my processors is faulty. This doesn't affect mac os 9, but it prevents me from booting os x and possibly causes machine to fail to enter target disk mode. Pram battery is new, no pins are bent on motherboard.

Anyone interested in a pair of Gravis, Mac MouseSticks?
They’re ADB (not USB). Low mileage, one owner. 



Make offer or trade. / PM me.

Right now it looks like there are only 2 patrons if you search by "position" in the member list. I think if the call for patrons were a bit more prominent you may see more activity.

Hi All,

I recently moved my hobby Mac mini G4 restoration business, os9.shop, from Vermont to Pennsylvania (due to obviously my own moving from VT to PA). During the last couple of months while the boxes of supplies were in transition I had limited inventory.

Anyway, things are back up now in Pennsylvania and that will mean I can ship domestic orders (US) more quickly since I am now more centrally located. If you're interested in an upgraded Mac mini G4 with SSD and the Mac OS 9 Lives remix of OS 9 pre-installed you can use promo code 10OFF125 to get $10 off at checkout on a 1.25 GHz mini at https://os9.shop

Thanks to this community that has been so supportive of this hobby business,
David

Oh no! I'll fix that right away! Tonight I'll watch 12 episodes of Star Trek. re

not interested in the Enterprise? i am borderline offended

My friend, that is not a philological reconstruction but simply a juxtaposition of the two “intentions” understood as “retro-futuristic” in my project (I am not interested in the details of the enterprise at all; I could have used anything else) 

Hi Darth Vader, I have two PowerBook laptops, 1.5GHz and 1.6GHz, that use a 9700 graphics card. I managed to boot them into OS9 and it's fantastic. The only problem is that the card sees it as if it were two monitors connected, and the resolution is 256 colors. I've tried many ATI drivers, but the situation remains the same. Could you (or someone) create an NDRV for this card? I'm not interested in 3D acceleration, but at 256 colors, some programs are unwatchable. If I could see thousands of colors, I'd be very happy. Or if there's already a working driver out there, is there a link? Let me know, thanks.

Welcome to Mac OS 9 Lives, makott! Italy is a beautiful country  that I've visited many times. Glad you found your way here