DTK Computer Apex 386/40 User Manual page 88

Blank Screen
About one minute after you turn on your system, a system prompt
(such as A or C) should appear on your monitor. If there is no prompt
on the monitor, follow the steps given below. Otherwise, continue to the
next section.
Adjust the brightness and contrast controls on your monitor. These are
similar to the brightness and contrast controls on a TV set. If the screen
is still blank, go on to the next step.
Make sure that the monitor power and signal cables are properly
connected.
Try substituting a monitor which is in good working order. If the
substitute monitor works properly, you may need to replace or repair
your monitor.
Try substituting a video display card which is in good working order. If
the substitute card works properly, you may need to replace or repair
your display card.
If after all these steps you have failed to find the cause of the problem,
you may need to check your motherboard. Consult your computer
dealer or a qualified technician for assistance.
RAM Test Fails
If your computer fails to pass the RAM test after you start your
computer, run through the following steps. Otherwise, skip ahead to
the next section.
Open your system unit and make sure that the RAM chips on the
motherboard are seated properly and that no pins are bent or out of
place.
Try substituting good RAM chips for those on your motherboard.
If the above steps fail to isolate the cause of your problem, you may
need to replace your motherboard. Consult your computer dealer or a
qualified technician.
4 Chapter 5: Troubleshooting