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If the system ROM is valid, the system starts normally.
If the system ROM fails the validation check, the FailSafe Boot Block ROM provides
enough support to start the system from a ROMPaq diskette, which will program the system
ROM with a valid image.
When the bootblock detects an invalid system ROM, The System Power LED blinks RED 8
times, one every second, followed by a 2 second pause. Also 8 simultaneous beeps will be heard.
A Boot Block recovery mode message is displayed on the screen (some models).
To recover the system after it enters Boot Block recovery mode, complete the following steps:
1. If there is a diskette in the diskette drive, remove the diskette and turn off the power.
2. Insert a ROMPaq diskette into the diskette drive.
3. Turn on power to the system.
4. If no ROMPaq diskette is found, you will be prompted to insert one and restart the computer.
5. If a setup password has been established, the Caps Lock light will turn on and you will be
prompted to enter the password.
6. Enter the setup password.
7. If the system successfully starts from the diskette and successfully reprograms the ROM,
then the three keyboard lights will turn on. A rising tone series of beeps also signals
successful completion.
8. Remove the diskette and turn the power off.
9. Turn the power on again to restart the computer.
The following table lists the various keyboard light combinations used by the Boot Block ROM
(when a PS/2 keyboard is attached to the computer), and explains the meaning and action
associated with each combination.
Keyboard Light Combinations Used by Boot Block ROM
Failsafe Boot
Block Mode
Num Lock
Caps Lock
Num, Caps,
Scroll Lock
Num, Caps,
Scroll Lock
Diagnostic lights do not flash on USB keyboards.
Service Reference Guide, d500
Keyboard
Keyboard
LED Color
LED Activity
Green
On
Green
On
Green
Blink on in
sequence,
one-at-a-time—
N,C,SL
Green
On
336492-003
Desktop Management
State/Message
ROMPaq diskette not present, is bad, or
drive not ready.
Enter password.
Keyboard locked in network mode.
Boot Block ROM Flash successful. Turn
power off, then on to reboot.
3–5
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