Use the following table to learn how to begin analyzing a power problem.
| Symptom | What you should do |
|---|---|
| System unit does not power on. | See Cannot power on system unit. |
| The processor or I/O expansion unit does not power off. | See Cannot power off system or SPCN-controlled I/O expansion unit. |
| The system does not remain powered on during a loss of incoming ac voltage and has an uninterruptible power supply (UPS) installed. | Refer to the UPS user's guide that was provided with your unit. |
| An I/O expansion unit does not power on. | See Cannot power on SPCN-controlled I/O expansion unit. |
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