64 TroubleshootingUniversal Serial Bus (USB) Specific ProblemsCommon Symptoms What YouExperience Possible SolutionsUSB interface is notworkingUSB peripherals arenot working• Check that your monitor isturned ON.• Reconnect the upstream cableto your computer.• Reconnect the USB peripherals(downstream connector).• Switch off and then turn on themonitor again.• Re-start the computer.• Some USB devices like externalportable HDD require higherelectric current; connect thedevice directly to the computersystem.High Speed USB 3.0interface is slow.High Speed USB 3.0peripherals workingslowly or not workingat all• Check that your computer isUSB 3.0-capable.• Some computers have bothUSB 3.0 and USB 2.0 andUSB 1.1 ports. Ensure that thecorrect USB port is used.• Reconnect the upstream cableto your computer.• Reconnect the USB peripherals(downstream connector).• Re-start the computer.