Failure
Indications
As
the
self-test progresses,
the
LED's
display
the
current
state.
At
the
end
of
the
test,
a power-
up
with
no errors
is
indicated by all LEDs
turned
off
and
by immediate
entry
into
the
boot
scanner.
Should a failure occur during
the
self-tests,
it
will
be
indicated
on
the
LEDs
at
the
end
of
the
tests.
If
there
was rnore
than
one failure,
the
highest priority failure will
be
indicated on
the
LEDs. All
the
LED values are shown in Table 5-5.
The
highest priority failure
is
also
output
to
the
beeper, if present.
The
lower seven bits of
the
LED value are
beeped
in seven tones as follows:,
• Most significant
bit
first.
• One second beep
per
bit.
• A zero (LED off)
is
represented by a
low
tone.
• A one (LED on)
is
represented by a high tone.
If
no failure occurs,
the
beeper
will
not
sound
off.
If
the
failure was a
Boot
ROM
checksum
error,
the
following message will
be
displayed:
CONTINUE
AT
OWN
RISK
(Press
RETURN
To
Continue)
Once
this
message has been printed,
the
I Return I key
must
be
pressed
to
continue
to
the
boot
scanner.
The
probability is fairly low
that
the
error
will adversely affect
the
user,
but
if
it
does,
it could
be
catastrophic.
For all
other
failures,
the
message:
WAITING
1
MINUTE
(Press
RETURN
To
Abort Wait)
will
be
displayed.
The
Boot
ROM
will
time
out
after
approximately one
minute
and
will
then
continue into
the
boot
scanner.
This
allows
time
for
the
display
to
warm
up
and
for
the
user
to
read
the
error
messages. These failures are usually non-fatal so, in
an
Unattended
Mode,
the
Boot
ROM
will
still
boot
the
first OS it finds. Pressing I Return I will
terminate
the
beeping
error
code
and
abort
the
one
minute
wait. Pressing I Return I will also make
the
computer
revert
to
the
Attended
Mode.
This
means
that
the
Boot
ROM
will display all OSs found
and
will
not
boot
one until one in
chosen
and
entered
by
the
user.
Troubleshooting
115
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