Dell OptiPlex 960 Service Manual page 141

The computer is in a normal on
condition.
The diagnostic lights are not lit
after the computer
successfully boots to the
operating system.
Steady
Blue
A possible processor failure
has occurred.
Steady
Blue
Memory modules are
detected, but a memory failure
has occurred.
Steady
Blue
A possible graphics card
failure has occurred.
Steady
Blue
A possible floppy drive or hard
drive failure has occurred.
Steady
Blue
A possible USB failure has
occurred.
Steady
Blue
No memory modules are
detected.
Steady
Blue
Memory modules are
detected, but a memory
configuration or compatibility
error has occurred.
Steady
Blue
A possible expansion card
failure has occurred.
Steady
Blue
Another failure has occurred.
Ensure that the display is connected and powered on.
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If the problem persists, contact Dell (see Contacting Dell).
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Reseat the processor (see Processor information for your computer).
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If the problem persists, contact Dell (see Contacting Dell).
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If two or more memory modules are installed, remove the modules (see your service manual), then
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reinstall one module (see your service manual and restart the computer. If the computer starts
normally, continue to install additional memory modules (one at a time) until you have identified a
faulty module or reinstalled all modules without error.
If available, install working memory of the same type into your computer (see your service manual).
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If the problem persists, contact Dell (see Contacting Dell).
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Reseat any installed graphics cards (see the "Cards" section for your computer).
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If available, install a working graphics card into your computer.
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If the problem persists, contact Dell (see Contacting Dell).
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Reseat all power and data cables.
Reinstall all USB devices and check all cable connections.
If two or more memory modules are installed, remove the modules (see your service manual), then
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reinstall one module (see your service manual) and restart the computer. If the computer starts
normally, continue to install additional memory modules (one at a time) until you have identified a
faulty module or reinstalled all modules without error.
If available, install working memory of the same type into your computer (see your service manual).
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If the problem persists, contact Dell (see Contacting Dell).
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Ensure that no special requirements for memory module/connector placement exist.
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Ensure that the memory you are using is supported by your computer (see the "Specifications"
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section for your computer).
If the problem persists, contact Dell (see Contacting Dell).
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1. Determine if a conflict exists by removing an expansion card (not a graphics card) and restarting
the computer (see the "Cards" section for your computer).
2. If the problem persists, reinstall the card you removed, then remove a different card and restart
the computer.
3. Repeat this process for each expansion card installed. If the computer starts normally,
troubleshoot the last card removed from the computer for resource conflicts.
4. If the problem persists, contact Dell (see Contacting Dell).
Ensure that all hard drive and optical drive cables are properly connected to the system board (see
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the "System Board Components" section for your computer).
If there is an error message on the screen identifying a problem with a device (such as the floppy
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