Troubleshooting power source problems1. Press the power button to ensure that your system is turned on. If the power indicator does not glowwhen the power button is pressed, press the power button firmly.2. Plug in another working power supply unit to ensure that the system board 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 needed specifications.Power supply unit problems1. Ensure that no loose connections exist.For example, loose power cables.2. Ensure that the power supply unit (PSU) handle or LED indicates that the PSU is working properly.For more information about PSU indicators, see the Power indicator codes section.3. If you have recently upgraded your system, ensure that the PSU has enough power to support thenew system.4. If you have a redundant PSU configuration, ensure that both the PSUs are of the same type andwattage.You may have to upgrade to a higher wattage PSU.5. Ensure that you use only PSUs with the Extended Power Performance (EPP) label on the back.6. Reseat the PSU.NOTE: After installing a PSU, allow several seconds for the system to recognize the PSU anddetermine if it is working properly.If the problem persists, see the Getting help section.Related LinksGetting helpTroubleshooting cooling problemsCAUTION: Many repairs may only be done by a certified service technician. You should onlyperform troubleshooting and simple repairs as authorized in your product documentation, or asdirected by the online or telephone service and support team. Damage due to servicing that isnot authorized by Dell is not covered by your warranty. Read and follow the safety instructionsthat are shipped with your product.Ensure that the following conditions exist:• System cover, cooling shroud, EMI filler panel, memory module blank, or back filler bracket is notremoved.• Ambient temperature is not higher than the system specific ambient temperature.• External airflow is not obstructed.• A cooling fan is not removed or has not failed.117
