I have a imac 350, and recently i picked up a 400mhz imac motherboard DV and so i swapped the 350 for the 400 and it worked for a little while, and when using it i noticed the screen was off center, so while i had it open and me not knowing about the control in the displays like a doof i turned the little knob on the high voltage rectifier that said screen and it adjusted the brightness, so i put it down and then i restarted to X and noticed the brightness was different than that of 9.2 so i shut down and toyed with the screen knob some more and then the screen wouldnt turn back on, so i put the 350 board back in and adjusted the screen to default and it worked fine,after that i put in the 400 board no longer gives video any more internally or externally, but i hear it booting because since the clock is off, it makes a system beep when it gets the desktop as an error so i know its booting, but i dont understand why theres no video so if anyone has any ideas besides not trying to upgrade your imac with a different motherboard(lets not forget i had it working:-) ) or messing with the high voltage rectifier that would be great!
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