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HP Z4 G4 Maintenance And Service Manual Page 54

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Nonsystem disk/NTLDR missing message.
Cause
Hard drive boot has been disabled in Computer Setup.
Bootable hard drive is not attached as first in a multi-hard drive
configuration.
Bootable hard drive is not listed first in the Boot Order.
Computer will not boot from hard drive.
Cause
The device is attached to a SATA port that has been hidden in
Computer Setup.
Boot order is not correct.
Hard drive is damaged.
Computer seems to be locked up.
Cause
Program in use has stopped responding to commands.
46
Chapter 6 Troubleshooting without diagnostics
Solution
3.
Install system files for the appropriate operating system.
Run the Computer Setup utility and enable the hard drive entry in
the Advanced > Boot Options list.
If attempting to boot from a hard drive, ensure it is attached to
the system board SATA0 connector.
Run the Computer Setup utility and select Advanced > Boot
Options and ensure the bootable hard drive is listed immediately
under the Hard Drive entry.
Solution
1.
Check SATA cable connections.
2.
Run the Computer Setup utility and ensure Device Available
is selected for the device's SATA port in Advanced > Port
Options.
Run the Computer Setup utility and change boot sequence in
Advanced > Boot Options.
Observe if the front panel Power LED is blinking RED and if any
beeps are heard. Look for POST error code messages during POST.
See
POST error messages and diagnostic front panel LEDs and
audible codes on page 65
to determine possible causes for
the blinking red and beep codes.
See the Worldwide Limited Warranty for terms and conditions.
Solution
1.
Use the task manager to close programs that do not
respond.
2.
Attempt the normal Windows "Shut Down" procedure. If this
fails, press the power button for four or more seconds to
turn off the power. To restart the computer, press the power
button again.

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