Need help with something I know nothing about ... iMacs

[MercenaryForHire]

Our school is "blessed" with the presence of approximately 600 hajillion Rev A 233MHz iMacs.

They're now "showing their age" by dying. The power supply is what's going, and apparently it's just the flyback that needs to be replaced.

[*]Press power button - light goes orange
[*]Mac startup noise - light goes green
[*]A few seconds later, Mac shuts off

Little help? Perhaps how/where to get these replacement parts, and advice maybe?

Thanks in advance.

- M4H