Replacing iMac firmware chip?
At this time I have the above machine that will not boot from any device.
When I try to boot, holding the power button down for an extended time, it gives a long beep which indicates the it is in the middle of a firmware upgrade, but if I leave it powered on for a long time the upgrade never completes.
So I think it need to have the firmware replaced (I was messing around with rEFIt when I started to have problems). My question is, how do I determine the logic board serial number so then I will know what type of firmware chip to purchase? Does anyone have any other suggestions?
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Is this a good question?