How do I test the power supply pin out.

I have an unresponsive intel imac and i was wondering if there is a way to how test the power supply so that i can see if it is functioning with my multi-meter and maybe a pinout voltages.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2944067:03crwdne2944067:0:

Need to some solution ASAP.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Any pin out diagrams.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

What are the diagnostic LEDs telling you?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0