Dell OptiPlex K7821 Quick Reference Manual page 22

Power Light
Solid yellow
Blinking yellow
Solid green and a
beep code during
POST
Solid green power
light, no beep code
and no video during
POST
Solid green power
light and no beep
code but the
computer locks up
during POST
22
Quick Reference Guide
Problem Description
The Dell Diagnostics is running a
test, or a device on the system board
may be faulty or incorrectly installed.
A power supply or system board
failure has occurred.
A problem was detected while the
BIOS was executing.
The monitor or the graphics card may
be faulty or incorrectly installed.
An integrated system board device
may be faulty.
Suggested Resolution
If the Dell Diagnostics is running, allow the
testing to complete.
Check "Diagnostic Lights" on page 23 to see if
the specific problem is identified.
If the computer does not boot, contact Dell
for technical assistance. For information on
contacting Dell, see your online User's Guide.
Check "Diagnostic Lights" on page 23 to see if
the specific problem is identified. See "Power
Problems" in your online User's Guide.
See "Beep Codes" on page 26 for instructions
on diagnosing the beep code. Also, check
"Diagnostic Lights" on page 23 to see if the
specific problem is identified.
Check "Diagnostic Lights" on page 23 to see if
the specific problem is identified.
Check "Diagnostic Lights" on page 23 to see if
the specific problem is identified. If the
problem is not identified, contact Dell for
technical assistance. For information on
contacting Dell, see your online User's Guide.