Manual

54 Troubleshooting
Universal Serial Bus (USB) Specific Problems
Common Symptoms What You
Experience
Possible Solutions
USB interface is not
working
USB peripherals are
not working
•Check that your monitor is
turned ON.
•Reconnect the upstream cable
to your computer.
•Reconnect the USB peripherals
(downstream connector)
•Switch o and then turn on the
monitor again.
•Reboot the computer.
• Some USB devices like external
portable HDD require higher
electric current; connect the
device directly to the computer
system.
High Speed USB 2.0
interface is slow.
High Speed USB 2.0
peripherals working
slowly or not working
at all
•Check that your computer is
USB 2.0-capable.
•Some computers have both
USB 2.0 and USB 1.1 ports.
Ensure that the correct USB
port is used.
•Reconnect the upstream cable
to your computer.
•Reconnect the USB peripherals
(downstream connector).
•Reboot the computer