No power, LEDs, or fan how to test power supply
I have this late 2006 20" iMac. It's had many hard drive issues over the years, currently running on drive #3.
Today I was browsing and the machine simply shut off as if someone yanked the power. Prior to this, no issues - no beachballing, no fans going crazy, no video artifacts - nothing unusual at all.
I tried all the normal troubleshooting stuff:
-SMC reset (both ways - the service manual says to hold the button for 10 seconds as the machine is plugged in, Apple's support says to hold it for 5 seconds with the machine unplugged)
-Unplug and let sit for many hours
-Check for USB power to keyboard (caps lock) or mouse (LED) - no power
-reseat RAM, try each stick by itself in each slot
-Open the thing and look for any diag LEDs (the service manual claims it has none other than the normal front panel "throbber"
I would splurge for a new power supply if I could confirm that's the issue, but I surely would not buy a new logic board.
If there's a sure fire way to test the PS, I'm all ears.
Is this a good question?