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On the photo you posted it's the clearer green spots on the AC side as Byrd mentioned. However sometimes traces are cut in ways that are not apparent at all to the naked eye, so it would be a good idea to check everything just in case.

I see some corrosion damage on the underside of the board. You should check for continuity between all supposedly connected solder pads.

Thanks for the tips everyone. I tried Toast versions 3.8 USB, 4.0.2, 4.1.3, 5.2.1 and 5.2.3 and none detected the cd-writer. Verdict: not compatible with Mac OS 9. That looks perfect, but I'm not in the US, so I'll see what I can find locally. Still good to know there are possibly new drives...

I haven't. I tried Toast 3 but it said there was no CD burner in my system. I'll try with version 4.5 as suggested and report back.

I have an iMac G3 450 DV+ and would like to burn CDs with it, so I got an external USB CD-R drive for cheap. Unfortunately I didn't check well enough which drives would be compatible with OS9, and so I bought an HP cd-writer cd4e: When I plug it in to the computer it just says that there's no...

This is great! I also recently drew the schematic for a TDK PSU, but it’s part number 614-0003. Seems similar enough to this one though. I can share it as well if there’s interest.

Not knowing much about the state of your PSU, so take this with a grain of salt, I doubt the problem is with the inductors. Can you explain what the symptoms are? Also note that there are other more common faults to look for, like diodes, the mosfet driver (Q1), the TL431 (IC54), burnt...

I'm probably a bit late, but these usually have very low resistance, so what makes you think yours are shorted?