HP t420 Troubleshooting Guide - Page 28

Diagnostics and Troubleshooting, LEDs, Wake-on LAN, S5 Maximum Power Savings

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B Diagnostics and Troubleshooting LEDs LED Status Power LED Off When the unit is plugged into the wall socket and the Power LED is off, the unit is powered off. However, the network can trigger a Wake On LAN event in order to perform management functions. Power LED On Displays during boot sequence and while the unit is on. During boot sequence, hardware initialization is processed and startup tests are performed on the following: ● Processor initialization ● Memory detection and initialization ● Video detection and initialization NOTE: If one of the tests fails, the unit will simply stop, but the LED will stay on. If the video test fails, the unit beeps. There are no messages sent to video for any of these failed tests. NOTE: After the video is initialized, anything that fails will have an error message. NOTE: RJ-45 LEDs are located inside the RJ-45 connector on the top, rear panel of the thin client. The LEDs are visible when the connector is installed. Blinking green indicates network activity, and amber indicates a 100MB speed connection. Wake-on LAN Wake-on LAN (WOL) allows a computer to be turned on or resumed from sleep or hibernation state by a network message. You can enable or disable WOL in Computer Setup using the S5 Maximum Power Savings setting. To enable or disable WOL: 1. Turn on or restart the computer. 2. Press either Esc or F10 while the "Press the ESC key for Startup Menu" message is displayed at the bottom of the screen. NOTE: If you do not press Esc or F10 at the appropriate time, you must restart the computer and again press Esc or F10 when the monitor light turns green to access the utility. 3. If you pressed Esc, press F10 to enter Computer Setup. 4. Navigate to Power > Hardware Power Management. 5. Set S5 Maximum Power Savings as follows: ● Disable WOL = Enabled ● Enable WOL = Disabled 6. Press F10 to accept any changes. 7. Select File > Save Changes and Exit. 22 Appendix B Diagnostics and Troubleshooting

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B
Diagnostics and Troubleshooting
LEDs
LED
Status
Power LED
Off
When the unit is plugged into the wall socket and the Power LED is
off,
the unit is powered
off.
However, the network can trigger a Wake On LAN event in order to perform management functions.
Power LED On
Displays during boot sequence and while the unit is on. During boot sequence, hardware initialization is
processed and startup tests are performed on the following:
●
Processor initialization
●
Memory detection and initialization
●
Video detection and initialization
NOTE:
If one of the tests fails, the unit will simply stop, but the LED will stay on. If the video test fails,
the unit beeps. There are no messages sent to video for any of these failed tests.
NOTE:
After the video is initialized, anything that fails will have an error message.
NOTE:
RJ-45 LEDs are located inside the RJ-45 connector on the top, rear panel of the thin client. The LEDs are visible when the
connector is installed. Blinking green indicates network activity, and amber indicates a 100MB speed connection.
Wake-on LAN
Wake-on LAN (WOL) allows a computer to be turned on or resumed from sleep or hibernation state by a
network message. You can enable or disable WOL in Computer Setup using the
S5 Maximum Power Savings
setting.
To enable or disable WOL:
1.
Turn on or restart the computer.
2.
Press either
Esc
or
F10
while the “Press the ESC key for Startup Menu” message is displayed at the
bottom of the screen.
NOTE:
If you do not press
Esc
or
F10
at the appropriate time, you must restart the computer and again
press
Esc
or
F10
when the monitor light turns green to access the utility.
3.
If you pressed
Esc
, press
F10
to enter Computer Setup.
4.
Navigate to
Power > Hardware Power Management
.
5.
Set
S5 Maximum Power Savings
as follows:
●
Disable WOL = Enabled
●
Enable WOL = Disabled
6.
Press
F10
to accept any changes.
7.
Select
File
>
Save Changes and Exit
.
22
Appendix B
Diagnostics and Troubleshooting