Dell DX6012S - Manual (Page 119)

Troubleshooting Your System
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Troubleshooting Your System
Safety First—For You and Your System
CAUTION:
Many repairs may only be done by a certified service technician.
You should only perform troubleshooting and simple repairs as authorized in
your product documentation, or as directed by the online or telephone service
and support team. Damage due to servicing that is not authorized by Dell is not
covered by your warranty. Read and follow the safety instructions that came
with the product.
Troubleshooting System Startup Failure
If your system halts during startup prior to video imaging, especially after
installing an operating system or reconfiguring your system’s hardware, check
for the following conditions.
• If you boot the system to the BIOS boot mode after installing an operating
system from the UEFI Boot Manager, the system will hang. The reverse is
also true. You must boot to the same boot mode in which you installed the
operating system. See "Using the System Setup Program and
UEFI Boot Manager" on page 45.
• Invalid memory configurations could cause the system to halt at startup
without any video output. See "Expansion Cards and Expansion-Card
Risers" on page 90.
For all other startup issues, note the system messages that appear onscreen.
See "System Messages" on page 22 and "System Messages" on page 22 for
more information.
Troubleshooting External Connections
Ensure that all external cables are securely attached to the external
connectors on your system before troubleshooting any external devices.
See Figure 1-1 and Figure 1-3 for the front- and back-panel connectors
on your system.
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