I need to replace the PSU on the above iMac. I can see there are three part numbers for the unit, They are 614-0420, -0421 and -0426. They look similar dimensions/ connectors, but have different components.
Are they interchangeable?
Is the last one an upgrade on the previous two and therefore the best to fit?
Are they interchangeable?
Is the last one an upgrade on the previous two and therefore the best to fit?