You may have burnt out the video card on the 400 MHz Board.

on 6/7/02 9:12 PM, Derek Scott at [EMAIL PROTECTED] wrote:

> 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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