You are troubleshooting an iMac (Early 2008) that does not power on. You notice that all diagnostic LEDs remain off when a known-good power cord is connected
to the iMac and to a known-good power outlet. What is most likely the cause of these symptoms?

A.
Faulty power supply

B.
Faulty optical drive

C.
Faulty LCD panel

D.
Faulty video card