Have you got an ADC Cinema display? I have a funky MDD that will ONLY come on when powered on through the ADC display power button. I don't know what it is, perhaps drawing that power through the card, but mine will do exactly what yours does if I try and use the front power button or don't...
The first diagnostic discs that I am aware of were MacTest Pro and I don't think they supported anything older than PCI based PowerMacs. For a Color Classic I think you would need a TechStep. If I'm wrong I'm sure somebody can point you in the right direction.
You're looking for the M7332 yoyo adapter. As for the install discs, which iMac did they come with? I don't think machine specific discs were an issue until the iMac G4 era because I've used the 9.1 installer from my old 2000 Indigo iMac G3 with other systems without issue.
The Macintosh Classic doesn't have any kind of expansion port, so there isn't any off-the-shelf way to add internal ethernet. Now thats not to say somebody hasn't figured out some way to do it, but not like the PDS slot in your color classic. If you want ethernet in a compact Mac with a black...
The models with iSights are more like the early Intel iMacs than the other G5 iMacs. Not nearly as easy to get into, and have different problems. If its as gross as you say, it could be a fan failure/overheating issue. I'd clean out the air exhaust really well and verify the machine isn't...
I bought a Mac Mini G4 when it was new back in 2005. It was a terrible machine then, and I would imagine even worse now. As far as G4s go, its got to be one of the worst. Terrible graphics card, 1GB max of slow DDR RAM, no gigabit ethernet, and still used ATA hard drives. Now mine was the...
It depends on which PowerMacs they are. The only graphite models that support Auto-MDIX (not needing a crossover cable) are the Gigabit Ethernet and Digital Audio. If your PowerMacs are the older Yikes or Sawtooth models, you need a crossover cable.
Thats some kind of butchered install disc that I wouldn't trust at all. IMO, your best bet is to find an actual un-modified OS disc to use. There are plenty of copies available on eBay for cheap. If all else fails, I'd be much more confident in this image than that one...
Things are changing so fast in regards to internet security and web development, even Classilla isn't good for much anymore. Seems like just about anything that starts to load is blocked by a security measure these days that may have worked fine even a year ago.
IMO the best option is an expansion card that gives you ethernet or wifi. For my 190 I got an Orinico Gold card and found that it does a wonderful job of getting on my local Appletalk network where I can transfer files much quicker than over the old LocalTalk or teletalk cables. The card ran...
Tiger will run pretty nicely on either machine, and Leopard will run pretty well on both too I would imagine. The G5 advantage is of course the MUCH faster system bus, double the RAM, and more graphics card & SATA HDD options. If I were to pick, I'd of course go G5 in this situation. Now...