KB-G265 only works with Windows, but not Mac.
It is a plug-n-play device and uses the Windows default driver.
Try to plug into another PC or USB port to see if the problem is the same.
If yes, the problem is with the USB port.
This is a plug-n-play device, it uses the Windows default driver. Check the manual for which keys to press to access the multimedia keys. If you still have a problem, contact customer support.
It should not block when you press the Ctrl key.
Contact customer support for assistance if your model is under warranty.
Unfortunately, we do not offer global warranty on our products.
Since it is still in the 30 day return period for Amazon, we suggest you return the defective unit to Amazon for exchange/refund. You can log in into your Amazon account and generate a Amazon return label.
Unfortunately, we do not provide technical manuals to end users, you can contact customer support for assistance.
We appreciate your feedback for your Genius product user experience