3. Check for a BPS0_AC_OK or a BPS1_AC_OK signal. If neither is asserted, then the AC supply
has a problem.
4. If any FRUs are missing or both AC supplies are not valid, then return to power off state.
5. Initialize I/O Expander settings prior to turning on power.
6. Set Power Sequencer Order. Set system frequency in Power Sequencer.
7. Pulse BMC_PWR_CMD to tell the Power Sequencer to enable the voltages in the system.
8. Wait for SEQ_MPON to know the power sequencer has finished and check if SEQ_STATUS=0
for a fault condition. If a fault has occurred, scan sensors for the cause and generate events.
9. Perform any pre-Reset Hardware Setup needed while power is on.
10. Release Reset by setting MPON=1.
Front Display Panel, DVD, and Diagnostic Panel
The front display panel, DVD, and diagnostic panel are supported on a single board, called the
display board, located in the front of the chassis. Service the display board from the top of the
chassis. The front display panel consists of the system status LEDs and a power switch. Use the
front display panel to determine the power status of the server and monitor the server as it progresses
through the boot cycle. Use the various LED states to assist with troubleshooting system problems.
A slimline DVD drive, or optional DVD+RW drive, is located above the hard disk drives in the
horizontal orientation of the front panel. There is a USB 2.0 port positioned between the DVD drive
and the front display panel.
Each customer replaceable unit (CRU), with the exception of the power supplies, has a unique set
of status indicators located on a diagnostic panel that you view through the top cover. CRUs include
components such as individual memory DIMMs, processors, and fans. LEDs that correspond to
each CRU illuminate when there is a problem.
Figure 6 Front Panel Display Card Location
Mass Storage
The server mass storage subsystem (SAS) features the following SAS components:
• Hard drives
• Cables
26 Overview
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