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POST Numeric Codes and Text Messages
This section covers those POST errors that have numeric codes associated with them. The section
also includes some text messages that may be encountered during POST.
NOTE: The computer will beep once after a POST text message is displayed on the screen.
Table B-1 Numeric Codes and Text Messages
Control panel message Description Recommended action
ERROR: No boot disk has been detected or
the disk has failed.
The computer cannot read the boot sector
of the boot disk.
1. Check drive data and power cables.
2. Use F10 Setup to make sure the first
boot device is set to drive C or the
primary hard drive.
3. The drive has failed due to mechanical
or virus corruption. Replace the drive.
Keyboard Error Keyboard failure. 1. Reconnect keyboard with computer
turned off.
2. Check connector for bent or missing
pins.
3. Ensure that none of the keys are
depressed.
4. Replace keyboard.
5. Replace the system board.
511-CPU Fan not Detected CPU fan is not connected or may have
malfunctioned.
1. Reseat CPU fan.
2. Reseat fan cable.
3. Replace CPU fan.
1720-SMART Hard Drive Detects Imminent
Failure
Hard drive is about to fail. (Some hard
drives have a hard drive firmware patch that
will fix an erroneous error message.)
1. Determine if hard drive is giving correct
error message. Enter Computer Setup
and run the Drive Protection System
test under Storage > DPS Self-test.
2. Apply hard drive firmware patch
if applicable. (Available at
http://www.hp.com/support.)
3. Back up contents and replace hard
drive.
Unsupported CPU Recently installed processor is not
supported by the system.
Install a processor supported by your
system.
Time & Date Not Set Invalid time or date in configuration
memory.
RTC (real-time clock) battery may need to
be replaced.
CMOS jumper may not be properly
installed.
Reset the date and time under Control
Panel (Computer Setup can also be used).
If the problem persists, replace the RTC
battery.
Check for proper placement of the CMOS
jumper if applicable.
POST Numeric Codes and Text Messages 93