HP Z4 Maintenance and Service Guide - Page 58

Solving hard drive problems

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Computer powered off automatically and the power light flashes red two times, once every second, followed by a two second pause, and the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing.) Computer powered off automatically and the power light flashes red four times and then white two times. Cause Solution Processor thermal protection activated. A fan may be blocked or not turning. 1. Ensure that the computer air vents are not blocked and the processor cooling fan (or other system fan) is running. 2. Remove the access panel and interior covers. 3. Press the power button, and see if the rear fan (or other fans) spins. 4. If the fan(s) does not spin, make sure the fan cable(s) is plugged onto the system board. 5. If fan cable(s) is plugged in and the fan is not spinning, replace the fan. Solving hard drive problems Hard drive error occurs. Cause Hard disk has bad sectors or has failed. Solution 1. Type file in the taskbar search box, and then select File Explorer from the list of applications. In the left column, expand This PC, right-click on a drive, select Properties, and then select the Tools tab. Under Error checking click Check. 2. Use a utility to locate and block usage of bad sectors. If necessary, reformat the hard disk. Disk transaction problem. Cause Either the directory structure is bad or there is a problem with a file. Solution Type file in the taskbar search box, and then select File Explorer from the list of applications. In the left column, expand This PC, right-click on a drive, select Properties, and then select the Tools tab. Under Error checking click Check. Drive not found (identified). Cause Cable could be loose. The system may not have automatically recognized a newly installed device. Solution Check cable connections. See reconfiguration directions in the Solving hardware installation problems on page 61 section. If the system still does not recognize the new device, check to see if the device is listed within Computer Setup. If it is listed, the probable cause is a driver problem. If it is not listed, the probable cause is a hardware problem. If this is a newly installed drive, run the Computer Setup utility and try adding a POST delay under Advanced > Boot Options. 50 Chapter 6 Troubleshooting without diagnostics

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Computer powered
off
automatically and the power light
flashes
red two times, once every second, followed by a two second
pause, and the computer beeps two times. (Beeps stop after
fifth
iteration but LEDs continue
flashing.)
Computer powered
off
automatically and the power light
flashes
red four times and then white two times.
Cause
Solution
Processor thermal protection activated.
A fan may be blocked or not turning.
1.
Ensure that the computer air vents are not blocked and
the processor cooling fan (or other system fan) is running.
2.
Remove the access panel and interior covers.
3.
Press the power button, and see if the rear fan (or other
fans) spins.
4.
If the fan(s) does not spin, make sure the fan cable(s) is
plugged onto the system board.
5.
If fan cable(s) is plugged in and the fan is not spinning,
replace the fan.
Solving hard drive problems
Hard drive error occurs.
Cause
Solution
Hard disk has bad sectors or has failed.
1.
Type
file
in the taskbar search box, and then select
File
Explorer
from the list of applications. In the left column,
expand
This PC
, right-click on a drive, select
Properties
, and
then select the
Tools
tab. Under
Error checking
click
Check
.
2.
Use a utility to locate and block usage of bad sectors. If
necessary, reformat the hard disk.
Disk transaction problem.
Cause
Solution
Either the directory structure is bad or there is a problem with a
file.
Type
file
in the taskbar search box, and then select
File
Explorer
from the list of applications. In the left column, expand
This PC
, right-click on a drive, select
Properties
, and then select
the
Tools
tab. Under
Error checking
click
Check
.
Drive not found
(identified).
Cause
Solution
Cable could be loose.
Check cable connections.
The system may not have automatically recognized a newly
installed device.
See
reconfiguration
directions in the
Solving hardware installation
problems
on page
61
section. If the system still does not
recognize the new device, check to see if the device is listed within
Computer Setup. If it is listed, the probable cause is a driver
problem. If it is not listed, the probable cause is a hardware
problem.
If this is a newly installed drive, run the Computer Setup utility
and try adding a POST delay under
Advanced
>
Boot Options
.
50
Chapter 6
Troubleshooting without diagnostics