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 Apple Technician Guide - 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 Profiler 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 />

Was USB device recognized?<br />

2. Is USB device receiving power<br />

from USB port? Note: first<br />

device to need >500ma will<br />

get 1000ma, all others are<br />

limited to

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