Power problemsUse this information to solve power problems.v Follow the suggested actions in the order in which they are listed in the Action column until the problem issolved.v If an action step is preceded by “(Trained technician only),” that step must be performed only by a trainedtechnician.v Go to the IBM support website at http://www.ibm.com/supportportal/ to check for technical information, hints,tips, and new device drivers or to submit a request for information.Symptom ActionThe power-control button doesnot work, and the reset buttondoes not work (the server doesnot start).Note: The power-control buttonwill not function untilapproximately 5 to 10 secondsafter the server has beenconnected to power.1. Make sure that the power-control button is working correctly:a. Disconnect the server power cords.b. Reconnect the power cords.c. (Trained technician only) Reseat the operator information panel cable, andthen repeat steps 1a and 1b.v (Trained technician only) If the server starts, reseat the operatorinformation panel. If the problem remains, replace the operatorinformation panel.v If the server does not start, bypass the power-control button by using theforce power-on jumper (see “System-board switches, jumpers, andbuttons” on page 29). If the server starts, reseat the operator informationpanel. If the problem remains, replace the operator information panel.2. Make sure that the reset button is working correctly:a. Disconnect the server power cords.b. Reconnect the power cords.c. (Trained technician only) Reseat the operator information panel cable, andthen repeat steps 2a and 2b.v (Trained technician only) If the server starts, replace the operatorinformation panel.v If the server does not start, go to step 3.3. Make sure that both power supplies installed in the server are of the sametype. Mixing different power supplies in the server will cause a system error(the system-error LED on the front panel turns on and the PS and CONFIGLEDs on the operator information panel are lit).4. Make sure that:v The power cords are correctly connected to the server and to a workingelectrical outlet.v The type of memory that is installed is correct.v The DIMMs are fully seated.v The LEDs on the power supply do not indicate a problem.v The microprocessors are installed in the correct sequence.5. Reseat the following components:a. Operator information panel connectorb. Power supplies6. Replace the components listed in step 5 one at a time, in the order shown,restarting the server each time.7. If you just installed an optional device, remove it, and restart the server. If theserver now starts, you might have installed more devices than the powersupply supports.8. See “Power-supply LEDs” on page 141.9. See “Solving undetermined problems” on page 177.166 IBM System x3550 M4 Type 7914: Installation and Service Guide
