HP Z1 G2 Maintenance And Service Guide

Activity Possible cause Recommended action
Power LED ashes red four
times, once every second,
followed by a two-second
pause. Four beeps.
Power failure (power
supply is overloaded).
CAUTION: Internal components might be powered even when the
computer is o. To prevent damage, disconnect the computer power
cord before you remove a component.
1. Open the access panel and verify that all power connections are
secure on the system board.
2. To verify if a device is causing the problem, remove all attached
devices (such as hard drives, optical drives, and expansion
cards.) Turn on the computer. If the system enters the POST, turn
o the computer 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 conrm that
all devices are functioning properly.
Power LED ashes red ve
times, once every second,
followed by a two-second
pause. Five beeps.
Pre-video memory error. CAUTION: Internal components might be powered even when the
computer is o. To prevent damage, disconnect the computer power
cord before you remove a component.
1. Reseat DIMMs.
2. Replace DIMMs one at a time to isolate faulty module.
3. Replace third-party memory with HP memory.
4. The problem might be on the system board. Contact HP for
assistance.
Power LED ashes red six
times, once every second,
followed by a two-second
pause. Six beeps.
Pre-video graphics error. CAUTION: Internal components might be powered even when the
computer is o. To prevent damage, disconnect the computer power
cord before you remove a component.
Try these solutions in this order:
●
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.
Processor does not
support graphics output
and no discrete graphics
card is installed.
Either install a processor with Intel HD Graphics, or install a supported
graphics card.
Power LED ashes red
seven times, once every
second, followed by a two-
second pause. Seven beeps.
System board failure
(ROM detected failure
prior to video).
1. Clear CMOS.
NOTE: See Clearing and resetting the CMOS on page 73 for
details.
2. The problem might be on the system board. Contact HP for
assistance.
Power LED ashes red eight
times, once every second,
followed by a two-second
pause. Eight beeps.
Invalid ROM based on bad
checksum.
CAUTION: Internal components might be powered even when the
computer is o. To prevent damage, disconnect the computer power
cord before you remove a component.
1. Clear CMOS.
NOTE: See Clearing and resetting the CMOS on page 73 for
details.
2. Upgrade the ROM using SoftPaq, either from the hard drive, CD,
diskette, or USB ash drive (for example, HP Drive Key). The ROM
can be ashed by through the F10 Setup Menu by going to
File>Flash System ROM. SoftPaq is a self-extracting executable,
64 Chapter 4 Diagnostics and troubleshooting

HP Z1 G2 Specifications

General

Brand	HP
Model	Z1 G2
Category	Desktop
Language	English