Sun Microsystems Ultra 20 M2 Service Manual page 34

TABLE 3-1
Problem
Workstation does
not power on when
the front-panel
Power button is
pressed.
Workstation halts
during POST
without displaying
error messages.
Workstation powers
on, but the monitor
does not.
Workstation does
not power off when
the front-panel
Power button is
pressed.
Workstation appears
to be in low-power
mode, but the Power
button LED does not
blink.
The network status
indicator does not
light up.
3-4 Sun Ultra 20 M2 Workstation Service Manual • January 2007
Troubleshooting Procedures
Possible solution
• Is the Power button LED illuminated on the front of the system?
Ensure that the power cord is connected to the system and to a
grounded power receptacle.
• Does the wall outlet have power?
Test by connecting another device.
• Does the system beep when the system is powered on?
The system beeps when no keyboard or a malfunctioning
keyboard is plugged in.
• Does the monitor sync within 5 minutes after the power-on?
The green LED on the monitor stops flashing and remains
illuminated.
• Is the monitor connected to the onboard video connector or PCI
Express video card? Connect the monitor to the active video
connector.
Check the BIOS POST LED display on the motherboard. See
Appendix B
• Is the Power button for the monitor turned on?
• Is the monitor power cord connected to a wall outlet?
• Does the wall outlet have power? Test by connecting another
device.
• Is the monitor connected to the onboard video connector or PCI
Express video connector?
• Try all of the power-off options described in
"Powering Off the Workstation" on page
• If the workstation still does not power off, disconnect the power
cable from the back of the chassis.
The power-indicator LED blinks only when all workstation
components are in low-power mode. A tape drive might be
connected to your workstation. Because tape drives do not enter
low-power mode, the power-indicator LED does not blink.
• Check the cabling and network equipment to make sure that all
cables are correctly seated.
• Reinstall the network drivers.
for detailed information on the POST codes.
Section 2.5,
2-6.