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Solving USB Problems
Problem
External device connected to
a USB connector does
not work.
External device connected to a
USB connector does not work
during startup (before
Windows 95 or later loads).
External devices in lower
tiers do not work.
Solving Memory Problems
Some common causes and solutions for memory problems are listed in the following
table.
Problem
Memory count during POST
is incorrect
"Out of Memory" message is
displayed on the screen or
insufficient memory occurs
during operation.
Table 2-26
Solving USB Problems
Probable Cause
The operating system limits
external devices connected
by USB to two tiers that can
include no more than two
hubs on the first tier and no
more than one keyboard and
one pointing device on the
first or second tier.
During startup, only two tiers
are supported by the USB
connector. These tiers can
include no more than two
hubs on the first tier and no
more than one keyboard and
one pointing device on the first
or second tier.
An unpowered hub is
connected to another
unpowered hub.
Table 2-27
Solving Memory Problems
Probable Cause
Optional memory expansion
board is installed incorrectly,
is incompatible with the
computer, or is defective
System ran out of memory for
the application
Too many terminate and stay
resident (TSR) applications
are running.
Recommended Action(s)
Reduce the number of connected external
USB devices to no more than two hubs on
the first tier, and no more than one keyboard
and one pointing device on the first or
second tier.
Use the external device only after
Windows 95 or later has loaded.
Reduce the number of connected
external USB devices to no more than
two hubs on the first tier, and no more
than one keyboard and one pointing
device on the first or second tier.
Use only powered hubs.
Make sure that all unpowered hubs are
immediately preceded by powered
hubs in the USB chain.
Recommended Action(s)
Ensure that the optional memory expansion
board is installed correctly
Check the application documentation for
memory requirements
Install additional memory.
Remove from memory any TSR applications
that you do not need
Troubleshooting 2-33
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