Hi Tony,
First guess would be a power issue. To check, I'd open the System Report (Apple menu->About this Mac->System Report) and check the USB section.
Is the ASUS monitor listed in the USB devices?
If not, it's likely power. In case, not much we can do on the driver side but there may be workarounds with different connections. How is the monitor connected? Is the OS complaining about power?
Kind regards,
Carlo
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