Computer appears locked up and will not turn off when the power button is pressed.
Cause | Solution | |
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Software control of the power switch is not functional. | 1. | Press and hold the power button for at least five seconds |
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| until the computer turns off. |
| 2. | Disconnect the power cord from the electrical outlet. |
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Computer shuts down automatically. |
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Cause | Solution | |
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Thermal protection has been activated. | 1. | The computer might be in an exceedingly hot |
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| environment. Let it cool down. |
| 2. | Clean the air vents on the front, back, or any other |
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| vented side of the computer. |
| 3. | Ensure that there is a 10.2 cm (4 in) clearance on all |
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| vented sides of the computer to permit the required |
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| airflow. |
| 4. | Ensure that computers are not stacked on top of each |
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| other or so near each other that they are subject to each |
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| other's |
| 5. | If the computer is within an enclosure, ensure that there is |
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| proper intake and exhaust ventilation for the enclosure. |
| 6. | If a message appears on the screen indicating that a fan |
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| is not working, replace the fan. |
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Computer will not respond to USB keyboard or mouse. |
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Cause | Solution | |
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Computer is in standby mode. | To resume from standby mode, press the power button or | |
| press any key. | |
| CAUTION: When attempting to resume from standby | |
| mode, do not hold down the power button for more than four | |
| seconds. Otherwise, the computer will shut down and you will | |
| lose any unsaved data. | |
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Computer date and time display is incorrect. |
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Cause | Solution | |
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RTC | First, reset the date and time under Control Panel | |
NOTE: Connecting the computer to a live AC outlet | (Computer Setup can also be used to update the RTC date | |
and time). If the problem persists, replace the RTC battery. | ||
prolongs the life of the RTC battery. |
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148 | Chapter 9 Troubleshooting Without Diagnostics |