1 - 2 horas
My iMac was dead and the LED's were confusing me. The brilliant help on these forums encouraged me to replace the power supply...BBBBBRRRRROOOONNNNGGGGGG! The Mac Power Chord played, the screen lit up, and my bride is thrilled to have her mac back!
Great! Followed the online instructions, no problem!
The folks here are great! Listen to them!