PSU and Video Card Diagnostics
A little history first, of course...
I recently replaced my video card in my iMac, as the 3rd LED light was coming on for a moment before initiating an endless reboot cycle.
After I reassembled my iMac, I noticed that it wasn't even getting to where I was before. The first LED is on and the 2nd and 3rd LED flash in unison and my fans give a little twitch when the LEDs light up. I unplugged the iMac and went over my connections to be certain everything was seated and plugged into correctly.
When I plugged in my iMac, there was a pop and a spark shot from my PSU. Undoubtedly this PSU is now toast...
but was the PSU the issue all along? Is it safe to assume that the video card I replaced had nothing wrong with it and the PSU just didn't have the juice to support it? And is there something else going on inside of the iMac that would cause the PSU to pop and spark?
Thanks for any help.
Is this a good question?