Table 7-22 Issues, possible causes, and xes (continued)
Items Procedures
1. See (2. Examine the environment on page 72). Pay attention to external power source,
high-frequency signals such as cell phones, microwave ovens.
2. Move the computer to dierent locations nearby to determine where it fails and where it
does not fail.
3. Test with a veried working computer in original factory conguration.
4. Consult with support.
No wake up
Use this information to troubleshoot wake-up issues.
Table 7-23 Issues, possible causes, and xes
Items Procedures
Symptoms
When resuming from a power
management state the computer may
display:
● Blank screen
● Some light activity
Possible causes
Power-saving mode; multiple-display setting.
Troubleshooting steps
1. Verify that front power light (7. Status lights, blinking light codes, troubleshooting
lights, and POST error messages on page 76) is blinking (indicating Sleep state). Press
power button to exit Sleep.
2. Reset BIOS to default (associated with OS Power Management in Power Menu) (4.
Update BIOS and drivers on page 72)
3. Check power management settings in Windows Power Options. Disable Sleep options if
the issue is resolved.
No wake up 99
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