HP Z1 Maintenance And Service Manual page 92

Table 4-7 Diagnostic lights and audible codes (continued)
Activity
two-second pause. Three
beeps.
Red Power LED blinks
four times, once every
second, followed by a
two-second pause. Four
beeps.
Red Power LED blinks
five times, once every
second, followed by a
two-second pause. Five
beeps.
Red Power LED blinks six
times, once every second,
followed by a two-second
pause. Six beeps.
Red Power LED blinks
seven times, once every
second, followed by a
two- second pause.
Seven beeps.
Red Power LED blinks
eight times, once every
second, followed by a
two-second pause. Eight
beeps.
82 Chapter 4 Diagnostics and troubleshooting
Possible cause
1.
2.
Power failure (power CAUTION:
supply is overloaded). the computer is off. To prevent damage, disconnect the
computer power cord before you remove a component.
1.
2.
Pre-video memory error. CAUTION:
the computer is off. To prevent damage, disconnect the
computer power cord before you remove a component.
1.
2.
3.
4.
Pre-video graphics CAUTION:
error. the computer is off. To prevent damage, disconnect the
computer power cord before you remove a component.
Try these solutions in this order:
●
●
●
Processor does not Either install a processor with Intel HD Graphics, or install a
support graphics output supported graphics card.
and no discrete
graphics card is
installed.
System board failure 1.
(ROM detected failure
prior to video).
2.
Invalid ROM based on CAUTION:
bad checksum. the computer is off. To prevent damage, disconnect the
computer power cord before you remove a component.
1.
Recommended action
Verify that the CPU is present.
Reseat the CPU.
Internal components might be powered even when
Open the access panel and ensure that all power
connections are secure on the system board.
Check if a device is causing the problem by removing all
attached devices (such as hard disks optical disk drives,
and expansion cards.) Power on the computer. If the
system enters the POST, power off and replace one device
at a time; repeat this procedure until failure occurs. Replace
the device that is causing the failure. Continue adding
devices one at a time to ensure all devices are functioning
properly.
Internal components might be powered even when
Reseat DIMMs.
Replace DIMMs one at a time to isolate faulty module.
Replace third-party memory with HP memory.
The problem might be on the system board. Contact HP for
assistance.
Internal components might be powered even when
Reseat the graphics card if using nVidia graphics; reseat
the processor if using Intel HD Graphics.
Replace the graphics card if using nVidia graphics or
replace the processor if using Intel HD graphics.
Replace the system board.
Clear CMOS.
NOTE: See Clearing and resetting the CMOS
on page 92 for details.
The problem might be on the system board. Contact HP for
assistance.
Internal components might be powered even when
Clear CMOS.