Alright here are the specs. I have a Rev. B iMac that's been upgraded with a Harmoni card, a 40GB HD, and has about 384 MB of RAM. It's running Panther and for basic functions it's still a great computer. Here's my problem:

Recently the screen is slow to come on/doesn't come on at startup. I STFFs and found a lot of talk about the a/v board and how it can go bad. What I've noticed is that unplugging and replugging the USB hub sometimes makes it work. Is this normal? Does that still mean this part is bad?

If so and the CRT will only work by replacing it, I'd rather go about putting a flat LCD in the iMac case a la the iPc mod on this forum. What exactly would I need to do this mod (power supply, etc.) Thanks!