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 Apple Technician Guide MacBook Pro (15-inch, Mid ... - tim.id.au

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2010-08-05<br />

Input/Output Devices<br />

USB Port Does Not Recognize Known Devices<br />

Unlikely c<strong>au</strong>se: LCD, hard drive, optical drive<br />

Quick Check<br />

Symptom Quick Check<br />

USB Port Does Not Recognize<br />

Known Devices<br />

USB-wired keyboard/mouse or<br />

USB flash drive not recognized<br />

Deep Dive<br />

1. Check the for latest software update.<br />

2. Use <strong>Apple</strong> System <strong>Pro</strong>filer to verify the computer<br />

recognizes the USB bus.<br />

3. Test port with known good <strong>Apple</strong> keyboard or<br />

mouse.<br />

4. Verify any USB hubs have sufficient power.<br />

Check Result Action Code<br />

1. Reset SMC and clear PRAM.<br />

Verify if USB device is<br />

recognized.<br />

2. Verify if USB device is<br />

receiving power from USB<br />

port. Note: first device to<br />

need >500mA will get 1000mA,<br />

all others will be limited to<br />

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