Hi! I just wondered what people's thoughts were on this; I've discussed options with a certified Apple engineer and he said, aside from a very costly replacement, there was pretty much no chance of repairing my Analogue Board, but the only thing that's wrong is (in his opinion) the demagnetising circuit, so everything *mostly* works, certainly all the computery bits work just fine. I was thinking of junking the eMac and selling the parts, but it would be so cool if I could organise a CRT-less case that accommodated the Logic Board, the Analogue Board, Hard Drive, Combo Drive, and fan - basically everything still as it is, including the weird on/off button which I understand is near impossible to use with a standard AT/X PSU.
Anyone know of any suitable cases? Doesn't have to be a computer case, although that might make things easier. I've seen the Headless eMac webpage but that doesn't really mention anything about cases and is more about removing the Analogue Board.
The main thing that's worrying me is how the Analogue Board would react without the CRT connected, and what I would do with all the HT stuff etc, obviously the neater (and safer) the solution the better - would the circuit be as dangerous without the CRT even when powered down?
Thanks for all your opinions and such! 
If eMacs are anything like G3 iMacs, you should be able to live with just the logic board. I believe that there is a mini-VGA port on the right side of the eMac logic board that should work fine without the analog board. You just need an Apple VGA Display Adapter (M8639G/A). Additionally, it is of course possible to use a standard ATX power supply on your eMac. You just can't connect it directly. Certain pins will have to be routed through inverters and other things, since Apple uses a different kind of soft on and soforth. I'm not sure of just how integrated the power supply is with the monitor, but the part that connects to the board should be a plug that includes all the vital pins and soft on controls, while the CRT is powered through a seperate branch of the supply. I wish you the best of luck with this project, and recommend that you try it!
This page here should probably help you a lot!
http://www.lbodnar.dsl.pipex.com/eServer/index.html
I can't be sure because I'm at school right now, and the site is blocked by the network's filter for some reason (as are most good proxy sites).
I don't know enough about electronics to do all that fancy inverter stuff, I'd rather keep the analogue board and the soft power switch stuff, and somehow disable the CRT driver side of the circuit. Before I start hacking up my board though I want to get hold of a suitable enclosure. Besides anything, keeping the Analogue Board means the unit can be quite flat and light and should be quieter than an ATX PSU. I'm not intending on spending any money on this venture, I may as well get the eMac repaired if that were the case. It's all about recycling in a fun and exciting way