Technical data

Troubleshooting
3–2
DIGITAL HiNote Ultra 2000 Service Guide
Troubleshooting Tips
In general, troubleshooting involves an organized system of approach to problem solving. Try
to isolate the problem and identify the defective device (hardware) or improper setting
(software). When you have a problem, you should do a thorough visual inspection of the
notebook computer.
• If none of the indicators are lit and you cannot hear the HDD spinning, then the notebook
computer is probably not receiving power.
• Make sure the power cord is plugged in, and the AC adapter is securely connected. The
LEDs on the AC adapter and the system should be on when connected to a working AC
source.
• If you are using a power strip or surge protector, ensure that these devices are turned on.
• When powering the system by battery, make sure the battery is charged.
Often problems are caused by improperly connected cables.
• If you are using peripherals such as the mouse or keyboard, make sure they are properly
connected to their respective ports. Ensure that none of the connector pins are bent or
broken.
• Check all cables connected to the notebook computer. If any are cut, frayed, or damaged
in any way, replace them right away. Never use a damaged cable. A damaged cable is not
only a fire hazard, it may also cause a short circuit, resulting in irreparable damage to the
notebook computer.
• Check all internal connections to ensure that they are secure. Often problems can occur
because a connection is loose or backwards.
Verify that all test equipment works before using it to test a malfunctioning component.
Verify that a component is the only malfunctioning part of the computer by replacing the
malfunctioning component with a properly functioning one, and then try to run the system. For
example, if you have tested an FDD in a test computer and found it to be bad, you should also
try a good FDD in the malfunctioning FDD’s computer to be sure that another component
(such as the FDD controller) is not bad as well.
As with assembly and disassembly, make sure you have adequate lighting, the right tools, and a
stable clean working environment.
The examples that follow provide useful tips and information that will help isolate and solve
some of the more common problems that may be encountered.
System Start Failure
When you turn On the computer, the system hangs before completing or starting the POST
(power on self-test). A power supply failure, POST failure, or boot-up failure can result in a
system start failure. Reset the system by pressing the reset button located under the keyboard
next to the hard drive (Figure 1-1) and restart the system.