242 Troubleshooting: Your ArrayTroubleshooting Power Supply/Cooling FanModuleCAUTION: Many repairs may only be done by a certified service technician.You should only perform troubleshooting and simple repairs as authorized inyour product documentation, or as directed by the online or telephone serviceand support team. Damage due to servicing that is not authorized by Dell is notcovered by your warranty. Read and follow the safety instructions that camewith the product.CAUTION: It is recommended that you turn off the host server before turning offthe array to prevent loss of data.1 Locate the faulty power supply and determine the status of the LEDs.• If the AC power LED is not lit, check the power cord and power sourceinto which the power supply is plugged.• Connect another device to the power source to verify if it isworking.• Connect the cable to a different power source.• Replace the power cable.If the problem is not resolved, see "Getting Help" on page 253.• If the DC power LED is not lit, verify that the power switch is turnedon. If the power switch is turned on, see step 2.• If the power supply’s fault indicator is lit, see "Getting Help" onpage 253.CAUTION: Power supply/cooling fan modules are hot-swappable. The array canoperate on a single power supply; however both modules must be installed toensure proper cooling. A single power supply/cooling fan module can be removedfrom a powered-on array for a maximum period of five minutes. Beyond that time,the array may automatically shut down to prevent damage.2 Reseat the power supply by removing and reinstalling it. See "Power Supplyand Cooling Fan Features" on page 27.NOTE: After installing a power supply, allow several seconds for the array torecognize the power supply and to determine if it is working properly.If the problem is not resolved, see "Getting Help" on page 253.
