Apple MD094LL/A manual Symptoms Quick Check USB Device Not Recognized

USB Device Not Recognized

Unlikely cause: LCD display, power supply, hard drive, optical drive, fans

Quick Check

Symptoms	Quick Check
USB Device Not Recognized	1.	Reset SMC.
• USB wired keyboard/mouse not	2.	For printers and external USB drives, make sure
recognized
		any external power source is plugged in and
• USB external drive not		operating to isolate a power issue with device.
recognized	3.	The iMac has 4 USB ports on rear of computer. Try
• USB camera not recognized
		each port to isolate a particular port malfunction.
• USB printer not recognized	4.	Test with a known-good wired keyboard or
		mouse to isolate a failed peripheral issue.
	5.	Test with a known-good USB cable when dealing
		with a printer or external USB drive, to isolate a
		USB cable issue.
	6.	Ensure that all software and firmware updates for
		this model have been installed to take advantage
		of any available bug fixes.
	7.	Launch Apple System Profiler and verify if device
		is visible on USB bus. If yes, then the USB port and
		cable are functioning properly. Contact device
		manufacturer to verify that device is supported.

Deep Dive

Check		Result	Action	Code
1.	Unplug all USB devices from	Yes	Test with all USB ports to
	the computer except for USB		ensure all USB ports working
	keyboard and mouse. Start		as expected. Replace logic
	computer and reset PRAM.		board for any port failures.
	Verify if USB keyboard and
		No	Reset SMC. Go to step 2.
	mouse are recognized.
2.	Verify if Bluetooth Mouse Setup	Yes	Bluetooth detected, but
	assistant launches after startup.		external USB devices not
			recognized. Go to step 3.
		No	Disconnect USB keyboard and
			mouse. Go to step 4.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices  104