HP 285 Maintenance and Service Guide - Page 78

Control Panel, times. Beeps stop after

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Blank screen (no video). Cause Monitor is configured to use an input that is not active. Solution To access Control Panel in Windows 7, click Start, and then select Control Panel. To access Control Panel in Windows 10, type control panel in the taskbar search box, and then select Control Panel from the list of applications. 2. Expand the Resolution box, and then use the sliding control to reset the resolution. Use the monitor's on-screen menu controls to select the input that is being driven by the system. Refer to the monitor's user documentation for more information on the on-screen controls and settings. Blank screen and the power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Pre-video memory error. 1. Reseat DIMMs. Power on the system. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. Blank screen and the power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Pre-video graphics error. For systems with a graphics card: 1. Reseat the graphics card (if applicable). Power on the system. 2. Replace the graphics card (if applicable). 3. Replace the system board. For systems with integrated graphics, replace the system board. Blank screen and the power LED flashes Red seven times, once every second, followed by a two second pause, and the computer beeps seven times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution System board failure (ROM detected failure prior to video). Replace the system board. 70 Chapter 6 Troubleshooting without diagnostics

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Blank screen (no video).
Cause
Solution
To access Control Panel in Windows 7, click
Start
, and then
select
Control Panel
.
To access Control Panel in Windows 10, type
control
panel
in the taskbar search box, and then select
Control
Panel
from the list of applications.
2.
Expand the
Resolution
box, and then use the sliding control
to reset the resolution.
Monitor is
configured
to use an input that is not active.
Use the monitor's on-screen menu controls to select the input
that is being driven by the system. Refer to the monitor's user
documentation for more information on the on-screen controls
and settings.
Blank screen and the power LED
flashes
Red
five
times, once every second, followed by a two second pause, and the computer
beeps
five
times. (Beeps stop after
fifth
iteration but LEDs continue
flashing.)
Cause
Solution
Pre-video memory error.
1.
Reseat DIMMs. Power on the system.
2.
Replace DIMMs one at a time to isolate the faulty module.
3.
Replace third-party memory with HP memory.
4.
Replace the system board.
Blank screen and the power LED
flashes
Red six times, once every second, followed by a two second pause, and the computer
beeps six times. (Beeps stop after
fifth
iteration but LEDs continue
flashing.)
Cause
Solution
Pre-video graphics error.
For systems with a graphics card:
1.
Reseat the graphics card (if applicable). Power on the
system.
2.
Replace the graphics card (if applicable).
3.
Replace the system board.
For systems with integrated graphics, replace the system board.
Blank screen and the power LED
flashes
Red seven times, once every second, followed by a two second pause, and the computer
beeps seven times. (Beeps stop after
fifth
iteration but LEDs continue
flashing.)
Cause
Solution
System board failure (ROM detected failure prior to video).
Replace the system board.
70
Chapter 6
Troubleshooting without diagnostics