HP ProDesk 600 G4 Micro Maintenance and Service Guide - Page 78

Solving hard drive problems

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Power LED flashes red four times, once every second, followed by a two second pause, and the computer beeps four times. (Beeps stop after fifth iteration but LEDs continue flashing.) Computer powered off automatically and the Power LED flashes red three times and then white four times. Cause Solution Power failure (power supply is overloaded). 1. If equipped with a voltage selector, check that the voltage selector, located on the rear of the power supply (some models), is set to the appropriate voltage. Proper voltage setting depends on your region. 2. Open the access panel and ensure the power supply cable is seated into the connector on the system board. 3. Check if a device is causing the problem by removing ALL attached devices (such as hard drives or optical drives). Power on the system. If the system enters POST, then power off and replace one device at a time and 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. 4. Replace the power supply. 5. Replace the system board. 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 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 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 82 section. If the system still does not recognize the new device, check to see if the device is listed within 70 Chapter 6 Troubleshooting without diagnostics

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Power LED flashes red four times, once every second, followed by a two second pause, and the computer beeps four times. (Beeps stop
after fifth iteration but LEDs continue flashing.) Computer powered off automatically and the Power LED flashes red three times and then
white four times.
Cause
Solution
Power failure (power supply is overloaded).
1.
If equipped with a voltage selector, check that the voltage
selector, located on the rear of the power supply (some
models), is set to the appropriate voltage. Proper voltage
setting depends on your region.
2.
Open the access panel and ensure the power supply cable is
seated into the connector on the system board.
3.
Check if a device is causing the problem by removing ALL
attached devices (such as hard drives or optical drives). Power
on the system. If the system enters POST, then power off and
replace one device at a time and 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.
4.
Replace the power supply.
5.
Replace the system board.
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
82
section. If the system still does not
recognize the new device, check to see if the device is listed within
70
Chapter 6
Troubleshooting without diagnostics