Owners Manual

Table 13. POST Diagnostic LED Patterns (continued)
A possible hard drive failure has
occurred.
• Re-seat all power and data cables.
A possible USB failure has
occurred
• Reinstall all USB devices and check all cable connections.
No memory modules are
detected.
• If two or more memory modules are installed, remove the
modules, then reinstall one module 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.
Power connector not installed
properly.
• Re-seat the 2x2 power connector from the power supply unit.
Memory modules are detected,
but a memory configuration or
compatibility error has occurred.
• Ensure that no special requirements for memory module/
connector placement exist.
• Ensure that the memory you are using is supported by your
computer.
A possible system board
resource and/or hardware failure
has occurred.
• Clear CMOS (Re-seat the coin-cell battery. See Removing and
Installing Coin-cell Battery).
• Disconnect all internal and external peripherals, and restart the
computer. If the computer boots, add the peripheral cards
back one by one until you find the bad one.
• If the problem persists, the system board / system board
component is faulty.
A possible system board failure
has occurred.
• Disconnect all internal and external peripherals, and re-start
the computer. If the computer boots, add the peripheral cards
back one by one until you find the bad one.
• If the problem persists, the system board is faulty.
Some other failure has occurred.
• Ensure that the display/monitor is plugged into a discrete
graphic card.
• Ensure that all hard drives and optical-drive cables are properly
connected to the system board.
• If there is an error message on the screen identifying a
problem with a device (such as the floppy drive or hard drive),
check the device to make sure it is functioning properly.
• If the operating system is attempting to boot from a device
(such as the floppy drive or optical drive), check system setup
to ensure the boot sequence is correct for the devices
installed on your computer.
System is in Recovery Mode
• BIOS checksum failure was detected and the system is now in
recovery mode.
Boot hand off
• Indicates end of POST process. LEDs are normally in this state
briefly as POST completes. Once the hand-off to the
operating system is done, the LEDs turn off .
48 Troubleshooting Your Computer