Digital Equipment STARION 20 Series, Service Maintenance Manual

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Digital STARION 9xx & 20xx PC Troubleshooting
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POST and Boot Informational Messages
(continued)
Message Description
System BIOS shadowed This indicates that the computer’s BIOS was successfully copied to
shadow RAM.
nnnn System RAM passed Where nnnn is the amount of system RAM (in kilobytes) that tested
successfully.
UMB upper limit segment
address: nnnn Displays the address of the upper limit of UMB. This indicates the
released segments of the BIOS that can be reclaimed by a virtual
memory manager.
Video BIOS shadowed This indicates that the computer’s video BIOS was successfully
copied to shadow RAM.
Computer Troubleshooting
Problem Possible Cause Action
No response
when the
computer is
turned on Main logic board failure.
Main logic board jumpers
incorrectly set.
CPU has failed.
Power Supply failed.
Replace main logic board.
Set all appropriate jumpers. Refer to “Main logic
board jumpers”.
Replace CPU.
Replace Power Supply.
Power is on, but
there is no
screen display Brightness and contrast controls
are not correctly set.
The Power Management has shut
the monitor off.
Monitor cable is incorrectly
installed.
Incorrect VGA drivers installed.
Video controller has failed.
Adjust the brightness and contrast controls.
Press [Shift] to reactivate monitor.
Check all monitor connections.
Install the correct VGA drivers. Refer to “Utilities
and Video Drivers”.
Replace the video controller.