What is the likely cause of an iMac (21.5-inch, Late 2013) producing a single error tone at startup that repeats every five seconds.
A.
The unit does not have RAM or RAM is not installed properly.
B.
The logic board has failed and must be replaced.
C.
The RAM does not pass data integrity tests.
D.
The hard drive has failed S.M.A.R.T. status.
Explanation:
https://support.apple.com/en-ca/HT202768