HP 300

CAUTION
Remember to turn the unit off and unplug it before removing any
assembly.
1. Turn the unit off.
2. Separate the bus expander from the computer.
3. Remove all accessory cards. Leave enough RAM installed that's configured at the top of
memory.
4. Leave the processor board in.
5. Remove the top cover and disconnect the ribbon cable from the backplane.
6.
Plug the unit in and turn it on. The Self-Test LED's should ripple and change state
several times.
7. If the LED's do not light or ripple, turn the computer off, unplug it, and relocate the
processor to the other system slot.
8.
Plug the computer in, turn it on, and watch the LEDs. If the LED's don't light or ripple,
either the motherboard or processor is bad. Replace one or the other and retest until the
LED's light and/or ripple.
Before you
can proceed further, the minimum configuration must work. If this configuration
works, then you can proceed to the next level, Functional Unit Troubleshooting.
Bus Expander Minimum Configuration
To get a minimum configuration in the bus expander, follow these steps after verifying the power
supply functions correctly.
CAUTION
Remember to turn the unit off and unplug it before renloving any
assembly.
1. Turn the unit off.
2. Remove all accessory cards except one that can be recognized by the self-test.
3.
Plug the bus expander in and turn it on.
4. Turn the computer on.
5. Verify the self-test identifies and/or correctly tests the accessory card in the bus expander.
If the accessory card does not pass self-test, turn both units off, and relocate the accessory
card to another slot.
108 Troubleshooting
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