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Could it be trying to go to a resolution that is not supported? What resolution is your CRT? Try connecting your CRT, fully boot, set the resolution as low as you can go and shutdown, remove CRT, add ADC monitor and boot back up. I don't have a 20" to test things.. but I do have 17", 22", and...

What about this one? And this thread says it is a straight through cable but ALL pins must be present for it to work.

Here is one version of an adapter pinout. I see that your KVM can output to Apple DB15 or VGA DB15, so it must have internal intricacies/adapter. I would agree with @joevt that the cables required are likely straight through from the 3 computers to the KVM.

Wow, I have never seen one fit backwards like that. Search your favorite shopping site for JAE 50 PATA adapter. No idea if these specific ones are compatible or not... it is a guessing (or buy and testing) game. I could not find one on Amazon or AliExpress. Let us know which one works for...

So this Apple thread says the boot ROM it toast. "Four beeps. Indicates there’s a bad checksum for the remainder of the Boot ROM. (Checksum refers to a method of determining whether data is corrupt.)" No idea if that is fixable... otherwise snag a cheap mobo on eBay (this is the only one I saw...

The video shows you are still getting the 4 beeps. Try disconnecting the hard drive and only leave the cdrom attached. When you power up, hold down Command-Option-R-P and see if you get other sounds (cycle through 3 boot chimes to fully reset everything).

Have you used the iFixIt guides for your disassembly or did you just wing it? I would disassemble and verify you have made all connections. The tray loader should have a 15pin video cable, and two other power connectors that drive the motherboard and the monitor (make sure they are is plugged...

There are many models of the iMac G3, so please include info from the data plate. What color? Is it tray load or slot load?

I tried the foot powder with a puck mouse disassembled and it still came out horrible (all parts attached to a tube to get the best angles). But it was a good base I could take into 3D modeller and use it as a background to rebuild it with modelling tools. Next time, I will try the...

1. Does it power on now without the 4 beeps? Screen comes on? Do you hear the Apple chime? Yes to all, ok, no to all, recheck your internal connections. 2. You cannot boot off cd, you just get the question mark folder? - Check your hard drive cable. Make sure the replacement hard drive is...

I have both a 20 and 23 inch Aluminum displays with missing foot pad / skit / rubber piece. Model A1081 and A1082. They seem to be held on with tiny double stick pads. I modeled in 3D and printed my own. Two layers of double sided foam. This one is a little short so I modified the file but...

Have a look around the Surplus Shed, maybe you can find some optical lenses that may work.

Here is a Penny and circuit board to compare. Penny close up Circuit board wide and close up I think that is pretty good for $6.

Granted if you can find the right parts, there is NO Maths or calculations needed for this method. No 3D printing. Parts: - Old enlarger (Free Geek $5) - Old webcam (Free Geek $1) - Selfie light (Free Geek - FREE) - small piece of flat metal to hold the selfie ring light above the lens (not...

Without knowing the real peaks and valleys, it may be best to just get a lock pick set and pick it... then once you have access to the lock, you can find a blank and grind a key (or 3D print one). I don't know if they only made 17 versions and somewhere, someone else's key will work on yours.

Photo of the key socket? Blade or round?

I have a little turntable that I can program the speed on to take photos for photogrammetry. Programmed with an arduino to run a stepper motor, I originally built it for use with my Creality Scan Ferret 3D scanner. The software for the scanner works best on windows, and I rearranged my office...

I have a few 17" Apple Studio Display M7649 on hand. I bought another one with a broken stand. When I got it home, it would power on, but not illuminate. I have another one that comes on but then powers off after 5-10 seconds. So with two bad ones, I was hoping to piece together one good...

A little google work should find you links like these: 2004 G5 PSU pinout Wrong direction, but general info is good.

More photos and a description of this journey will be appreciated!