Troubleshooting Power Supply Units; Power Source Problems; Power Supply Unit Problems; Troubleshooting Cooling Problems - Dell Precision Rack 7910 Owner's Manual

If the date and time are not correct in the System Setup, check the SEL for system battery messages.

Troubleshooting power supply units

Prerequisites
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.

Power source problems

Steps
1. Press the power button to ensure that your system is turned on. If the power indicator does not light up when the power
button is pressed, press the power-on button firmly.
2. Plug in another working device to ensure that the power outlet is not faulty
3. Ensure that no loose connections exist.
For example, loose power cables.
4. Ensure that the power source meets applicable standards.
5. Ensure that there are no short circuits.
6. Have a qualified electrician check the line voltage to ensure that it meets the required specifications.

Power supply unit problems

Steps
1. Ensure that no loose connections exist.
For example, loose power cables.
2. Ensure that the power supply handle/LED indicates that the power supply is working properly.
3. If you have recently upgraded your system, ensure that the power supply unit has enough power to support the new system.
4. If you have a redundant power supply configuration, ensure that both the power supply units are of the same type and
wattage.
5. Ensure that you use only power supply units with the Extended Power Performance (EPP) label on the back.
6. Reset the power supply unit.
NOTE: After installing a power supply unit, allow several seconds for the system to recognize the power supply unit and
determine if it is working properly.

Troubleshooting cooling problems

CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
Ensure that the following conditions exist:
● System cover, cooling shroud, EMI filler panel, or back-filler bracket is not removed.
● Ambient temperature is not higher than the specified ambient temperature.
● External airflow is not obstructed.
● A cooling fan is not removed or has not failed.
Troubleshooting your system 87