Troubleshooting Without Diagnostics
Solving Power Supply Problems
Solving Power Supply Problems
Problem | Cause | Solution |
Computer won’t turn on (Power LED on front of computer not on).
Computer is not connected to an external power source.
Connect to an external power source.
Cables to the external | Ensure that cables connecting the |
power source are | computer to the external power |
unplugged. | source are plugged in properly |
| and the wall outlet is active. |
|
|
Power switch not | Plug the power switch cable into |
connected to the | the system board. |
system board |
|
(supported on select |
|
models only). |
|
Power line selector switch on rear of computer chassis not switched to correct line voltage (115V or 230V) (some models).
Select the proper AC voltage using the slide switch.
| Wall outlet is defective. | Test the outlet by connecting a |
|
| different electrical device to the |
|
| outlet. |
|
|
|
Power LED flashes Red or | Power supply | Unplug computer from AC power. |
Yellow every 2 seconds on | overloaded or short | Unplug internal power cables from |
most models. | was detected. | all devices and unplug all PCI |
|
| cards. Reconnect devices one at |
|
| a time and turn power on to identify |
|
| the cause. |
|
|
|
| Diskette drive power | When installing power cable to |
| cable not properly | diskette drive, ensure that all 4 pins |
| connected. | on the drive are connected to the |
|
| power cable connector. |
|
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Troubleshooting Guide |
