Troubleshooting guide

7-18 Dell OptiPlex GX1 and GX1p Midsize Managed PC Systems Reference and Installation Guide
If you are installing an internal SCSI device
, firmly press the SCSI cable’s header
connector onto the 50- or 68-pin connector on the back of the device.
The connectors on narrow SCSI cables are keyed for proper positioning—a raised
area on the outside of the header connector fits into a notch in the shroud sur-
rounding the 50-pin connector on the device. The connectors on wide SCSI
cables are shaped so that they can be attached one way only.
If you are installing an external SCSI device
, connect one end of the external SCSI
cable to the SCSI bus connector on the back of the device.
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If you are installing an internal SCSI device
, connect the colored edge on the
internal SCSI cable to the pin-1 end of the 50-pin connector (for a narrow
SCSI device) or the 68-pin connector (for a wide SCSI device) on the adapter
card, and then press the cable connector firmly onto the adapter card
connector.
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If you are installing an external SCSI device
, connect the other end of the ex-
ternal SCSI cable to the external connector on the adapter card.
For additional instructions, see the documentation that came with the adapter
card.
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If you are installing an internal SCSI device
, connect a DC power cable to the
power input connector on the SCSI device.

If you are installing an external SCSI device
, connect the socket end of the
power cable into the AC power receptacle on the back of the SCSI device.
Connect the other end of the power cable into a standard electrical wall
outlet.
Check all other cable connections. Fold all internal cables out of the way to pro-
vide airflow for the fan or cooling vents.
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NOTE: After you remove and replace the cover, the chassis intrusion detector will
cause the following message to be displayed at the next system start-up:
ALERT! Cover was previously removed.
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See Chapter 2, “Using the System Setup Program,” for instructions.