UMAX Technologies Astra 2100U - Manual (Page 94)

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Solution:
Many Macintosh computers have at least two USB ports. We
recommend that you connect your scanner directly to one of these
ports. Daisy-chaining the scanner, or running the scanner through a
hub can cause the signal to be lost before it is communicated to
your computer.
To make the troubleshooting process easier, disconnect your
scanner from other USB capable devices or hubs when
troubleshooting.
Problem:
I cannot get the scanner to install properly, or it does not run once it
is installed.
Solution:
If you are having problems installing or using the Astra 2100U
scanner, ensure that Macintosh OS 8.1 or higher is installed on your
computer.
Problem:
The system takes too long to scan.
Solution:
Disable virtual memory, reboot your computer with the extensions
disabled (hold down the SHIFT key during re-boot) and try again.
Booting with the shift key still loads the extension.
Problem:
Your system goes to the Finder when you try to acquire the
scanner.
Solution:
Plug the scanner into its own power outlet. If still does the same
thing, please call UMAX Technical Support.