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9.
If you installed a display adapter card (and did not connect it
to the feature connector on the main system board), you
must set jumper JP7 to disable the built-in VGA adapter.
Otherwise, you will not see any display on the screen. You
may also need to change the setting of jumper JP5. See
“Jumper Settings” in Chapter 3 for instructions.
10.
If your computer suddenly stops operating, its power
supply thermal detection circuits may have detected
excessive operating temperatures and automatically shut
down the power. This protects your system from damage.
When these circuits detect a high temperature, they shut off
all the DC outputs in the power supply and cause it to go
into latch-off state. This does not damage the power supply,
but you must correct the temperature problem before you
can use your computer again. See “Restoring the Power
Supply,” below.
Restoring the Power Supply
To restore normal power supply operation, follow these steps:
1.
Turn off the computer and leave it off for at least
30 seconds to reset the power supply logic.
2.
To determine the cause of the high temperature and correct
the condition, check for the following:
Room temperature above 95°F (35°C). If this is the case,
relocate the computer to a cooler area.
Cl
A blocked power supply fan. Make sure there is space
around the power supply fan vents in the back and
sides of the computer case. Remove the computer’s
cover and check both inside and outside the computer
for blockage. Make sure there is ample room around
your system for air circulation.
7-8 Troubleshooting