MCT61,
Welcome to LQ forums.
I am guessing that your model is ASUS 551CA. If not then change the following suggestion accordingly.
Whilst you still have W8 64-bit or similar installed, it might be a good idea to
update the BIOS to the latest version (211), prior to installing Linux Mint, if you have not already done so.
Make sure that the laptop is
connected to the mains and not just running on its battery!
Enter your OS and download the 211 BIOS zip file:
https://www.asus.com/Laptops/X551CA/HelpDesk_Download/
Then extract all files to a folder.
This folder can be copied and pasted to a USB drive.
Leave the USB drive plugged in to the laptop and then reboot whilst tapping the F2 key in order to access the BIOS.
Select the Advanced tab and then highlight Easy Flash. Press Enter.
Select the BIOS file from the USB drive.
Do you want to update BIOS? Click on Yes.
Let the laptop shutdown automatically and then remove the USB drive.
Reboot with the latest BIOS version.