Apex domains cannot have CNAME records.
Question and response
Question
dig jdcomputers.com.au. NS
Answer
jdcomputers.com.au. 2 NS dns1.namecheaphosting.com.
jdcomputers.com.au. 2 NS dns2.namecheaphosting.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0