thanks for the links
wish I could find a imac pinout for my unit
did find a same year different model Imac 27 vs my 21.5
but at the motherboard end of the power cable
27'' pinout at the M/b power connection
https://d3nevzfk7ii3be.cloudfront.net/igi/moS64VEIPaD6QDkR
apple for unknown reasons or a whim splits my power cable into two separate connections/plugs on the M/B
unlike the 27'' model that I found the pinout for [at least some pins ] with all 14 pins on one plug
but it doesNOT list all pins ID's the 3.3 pin as signal no volts listed
I just hope the pin #'s match both between the 27 and 21.5 and at the motherboard end = the p/s end for the mid 11 imac's