Hi, Lux61.
We understand that you’re trying to connect your Kobo Clara HD eReader to your new MacBook Air, but your MacBook isn’t detecting that your eReader is connected via the USB ports. It sounds like you’ve installed the Kobo Desktop app on your MacBook, and you’ve tried connecting with various cables, to no avail.
We suggest starting with the steps outlined in “Get the best performance from your USB devices” here:
About USB on Mac computers - Apple Support
Note that one of the steps outlines checking for an update. This article will help:
Update your Kobo eReader – Rakuten Kobo
You can find a great library of troubleshooting details for your Kobo eReaders on the Kobo support page.
If you’re still not able to get your eReader to show, try this:
- Disconnect your eReader
- Restart your MacBook Air
- Reconnect your eReader using the USB cable that came with the device directly to your MacBook
- Check the System Report under Hardware > USB to see if your MacBook detects that a device is connected as outlined here:
About System Information on your Mac - Apple Support
If it doesn’t appear in System Report, it may be time to reach out to Apple Support for guidance.
Get Support
We appreciate you taking the time to post in the Apple Support Communities.
Have a great day!