For further repair information, refer to the iMac Intel 21.5" EMC 2544 guides.
Identification and Background
This iMac was released in March 2015 and was originally only available to educational institutions. It is similar in construction to late 2012 iMac models, but has a slower processor, much slower graphics that share memory with the system, less RAM, and a smaller hard drive. It can be identified by its model number A1418 and EMC number, 2545, both of which are located beneath the single foot.