Not Powering on Even After Replacing Power Supply (iMac 27" EMC 2429)
I initially opened up the iMac to replace the HDD because I heard a clicking noise coming from the upper middle area. However after replacing the HDD, my iMac would not turn on. With the display removed, I noticed that a clicking noise was coming from the power supply. I also noticed some discoloration around the edges of the power supply.
After replacing the power supply (purchased from iFixit), my iMac was still not powering on. Only the #1 diagnostic light was on. I tried holding the power button in while plugging in the power cord, and then pressing the power button. All the fans came on at full speed but the computer still did not boot. Still, only the #1 diagnostic LED turned on.
Trying to boot the computer without the RAM installed did not change the behavior.
Is this a good question?