IBM Personal Computer Manual To Operations page 84

Example 4
Screen Response
Audio Response Action
11I1I1I1I1I1II1IIf§l1
. . No response
See below
Blank screen
or
or
Any response
May display
other than 1
anything short beep
Do you have an expansion unit attached?
NO - Have the system unit serviced.
YES - Do the following:
1. Set the Power switches on the system unit
and expansion unit to Off.
2. Set the Power switches on all attached
devices to Off.
3. Disconnect the expansion-unit cable from
the system unit.
4. Set the Power switch on the system unit to
On.
If the error is the same, have the system unit serviced.
If the error changes, have the expansion unit and its
cable serviced.
30-10 Start
April 1984