This genuine Apple power supply is guaranteed to be 100% compatible with EMC# 2429 (27 inch, Mid 2011) iMacs. You will find your iMac's EMC# printed underneath its stand. Not compatible with any other iMac EMC#.
'CTO' (sometimes 'BTO') indicates that the computer was Configured to Order (Built to Order) by Apple.
If you need confirmation that your power supply is faulty, or if you are not comfortable replacing the part yourself, we offer both free diagnostics and a turnkey repair/install service for this part: -> 27-inch iMac Power Supply Repair
Our FREE Diagnostic Service will quickly fix your Sad Mac problems.