Emac with dead display

Hi guys. I was lucky enough to pick up a triplet of eMacs yesterday. one of them is a 700mhz model that was working until the power button tore off. The other two I was told were 1ghz models, but the CD tray reports 1.25ghz (woohoo!!)
The one is in pieces, and the thermal pipe is too bent for me to fix it, so I am focusing on the one that is together. It chimes, I get the white light, and using my aluminum keyboard, I am able to make the volume pop, and eject the drive, so I know it is fully booted. I tried the brightness buttons, but they have no effect.
The display does make a crackling noise when it comes on like the 700mhz model, but nothing comes up, and I don't get the static feel from the front glass like I can on other monitors. There is however a quick flash of light in the upper left corner of the monitor. it only happens once, and only for a second.
The machine is sadly not covered under the repair program, since the serial number does not match with the ones in the program. However, and what is odd, the last 3 digits of the serial number do not match with the Apple KB on how to identify your eMac, and the configuration is an odd one: 1.25ghz/256mb/40gb/CD. According to mactracker, the 1.25ghz model only came with a combo or superdrive. Also, this model, like the other 2, does not have a modem, even though the port symbol is still there. I got these from a school, so that would explain that.
If I brought this in to an apple store, do you think they would be able to do anything with it, or does anyone know what the problem is so I could fix it myself? In my mind, it is worth it, and would make a fine replacement for my battle weary B&W G3. I have been looking for a faster machine that can run leopard, and this is it. If I can't get it fixed, I might just end up buying a mini VGA adapter and use it with my LCD, but I was hoping to get the higher than 1024x768 resolution of the built in CRT.

Thanks for all the help. I got a 3rd 1.25ghz mac, a consumer model with a bad motherboard with leaked capacitors. I was told it had a bad tube, but I swapped in the mobo from the one that sounded like it was booting fully, and tada!! a much newer mac than my B&W G3 for free!! I even got a modem out of it from the dead motherboard. Not that I will need it anytime soon, but you never know. it went in the machine just in case.
I am now in the process of reassembling the 700mhz and hopefully I will have 2 eMacs. I hope the shell from the 1.25ghz will work, even though there are 2 fewer screws. It does fit, and it is my only shell with a working power button at this point.
About the only issue is the tube is kinda pink when she first boots (the grey screen with the apple logo has a light pink hue to it), but it goes away after a few minutes. I hope that does not mean it's dying. The machine also seems to take quite a long time to power up. About 20 seconds from the time I press the power button until I get anything on the screen. Must need to warm up, but coming out of sleep mode, the screen is up in less than 5 seconds.

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