Serial number
i try to input my serial number for a trade in and it keeps on saying that it does not exist
i try to input my serial number for a trade in and it keeps on saying that it does not exist
Hold down the Option key, go to the menu and select System Information.
In the Hardware Overview find and copy the serial number
and paste into the trade in webpage.
Did you buy this machine from Apple? Have you ever had the mother board replaced?
Make sure that you're using zeros instead of the letter "O". There are no letter O's in a serial number. Also true for number 1s, there are no letter I's in a serial number.
Serial number