Cannot power off system unit

Use this procedure to analyze a failure of the normal command and control panel procedures to power off the system unit.

1. Attempt to power off the system.
   Does the system unit power off, and is the power indicator light flashing slowly?

   • No: Continue with the next step.
   • Yes: The system is not responding to normal power off procedures, which might indicate a Licensed Internal Code problem. Contact your next level of support. This ends the procedure.
2. Attempt to power off the system by using ASMI.
   Does the system power off?

   • Yes: The system is not responding to normal power off procedures, which might indicate a Licensed Internal Code problem. Contact your next level of support. This ends the procedure.
   • No: Continue with the next step.
3. Attempt to power off the system by using the control panel power button.
   Does the system power off?

   • Yes: Continue with the next step.
   • No: Go to step 5.
4. Is there a reference code logged in the ASMI, the control panel, or the management console that indicates a power problem?
   • Yes: Complete problem analysis for the reference code in the log. This ends the procedure.
   • No: Contact your next level of support. This ends the procedure.
5. Ensure that no jobs are running on the system or partition, and verify that an uninterruptible power supply (UPS) is not powering the system. Then, continue with the next step.
6. Complete the following steps:
   1. Remove the system unit AC power cord from the external UPS or, if an external UPS is not installed, from the customer's AC power outlet.
      If the system unit has more than one AC line cord, disconnect all the AC line cords.
   2. Exchange the following FRUs one at a time. For more information about FRU locations and parts for the system that you are servicing, see Part locations and location codes and System parts.

      If the system unit is failing:

      1. Power supply. Go to step 7.
      2. Service processor
      3. System control panel

      This ends the procedure.

7. A power supply might be the failing item.
   Attention: When you replace a redundant power supply, a 1xxx1504, 1xxx1514, 1xxx1524, or 1xxx1534 reference code might be logged in the error log. If you just removed and replaced the power supply in the location that is associated with this reference code, and the power supply came ready after the install, disregard this reference code. If you did not previously remove and replace a power supply, the power supply did not come ready after installation, or there are repeated fan fault errors after the power supply replacement, continue to follow these steps.

   Is the reference code 1xxx15xx?

   • No: Continue with the next step.
   • Yes: Complete the following steps:
   1. Find the unit reference code in one of the following tables to determine the failing power supply.
   2. Ensure that the power cables are properly connected and seated.
   3. Is the reference code 1xxx1500, 1xxx1510, 1xxx1520, or 1xxx1530 and is the failing unit configured with a redundant power supply option (or dual line cord feature)?
      • Yes: Complete PWR1911 before you replace parts.
      • No: Continue with step 7.d.
   4. For more information about FRU locations for the system that you are servicing, see Part locations and location codes.
   5. Replace the failing power supply (see the following table to determine which power supply to replace).
   6. If the new power supply does not fix the problem, complete the following steps:
      1. Reinstall the original power supply.
      2. Try the new power supply in each of the other positions that are listed in the table.
      3. If the problem still is not fixed, reinstall the original power supply and go to the next FRU in the list.
      4. For reference codes 1xxx1500, 1xxx1510, 1xxx1520, and 1xxx1530, exchange the power distribution backplane if a problem persists after you replace the power supply.

   Table 1. System unit

   Unit reference code	Power supply
   1510, 1511, 1512, 1513, 1514, 7110	E1
   1520, 1521, 1522, 1523, 1524, 7120	E2

   Attention: For reference codes 1500, 1510, 1520, and 1530, complete PWR1911 before you replace parts.

   This ends the procedure.
8. Is the reference code 1xxx2600, 1xxx2603, 1xxx2605, or 1xxx2606?
   • No: Continue with the next step.
   • Yes: Complete the following steps:
   1. For more information about FRU locations for the system you are servicing, see Part locations and location codes.
   2. Replace the failing power supply.
   3. If the new power supply does not fix the problem, complete the following steps:
      1. Reinstall the original power supply.
      2. Try the new power supply in each of the other positions that are listed in the table.
      3. If the problem still is not fixed, reinstall the original power supply and go to the next FRU in the list.

      Attention: Do not install power supplies P00 and P01 AC jumper cables on the same AC input module.

      Table 2. Failing power supplies

      System or feature code	Failing power supply
      System unit	Un-E1, Un-E2

      This ends the procedure.
9. Is the reference code 1xxx8455 or 1xxx8456?
   • No: Return to Starting a repair action. This ends the procedure.
   • Yes: One of the power supplies is missing, and must be installed. Use the following table to determine which power supply is missing, and install the power supply. For more information about FRU locations for the system you are servicing, see Part locations and location codes.

   Table 3. Missing power supplies

   Reference code	Missing power supply
   1xxx8455	Un-E1
   1xxx8456	Un-E2

   This ends the procedure.