Dell OptiPlex 755 - Manual (Page 211)

Dell Diagnostics
When to Use the Dell Diagnostics
If you experience a problem with your computer, perform the checks in this section and run the Dell Diagnostics before you contact Dell for technical
assistance.
It is recommended that you print these procedures before you begin.
Enter system setup (see Entering System Setup ), review your computer's configuration information, and ensure that the device you want to test displays in
Short! decoding circuitry in the
memory has occurred.
C: Drive Error
C: Drive
Failure
The hard drive is not
working or is not
configured correctly. Ensure that the hard drive is installed
correctly in the computer (see the "Drives"
section for your computer) and defined
correctly in the system setup program (see
System Setup ).
Cache Memory
Bad, Do Not
Enable Cache
The cache memory is not
operating. See Contacting Dell for instructions on
obtaining technical assistance.
CH-2 Timer
Error
An error is occurring on the
timer on the system board. See Contacting Dell for instructions on
obtaining technical assistance.
CMOS Battery
State Low
CMOS Checksum
Failure
CMOS System
Options Not Set
CMOS Display
Type Mismatch
CMOS Memory
Size Mismatch
CMOS Time and
Date Not Set
The system configuration
information in the system
setup program is incorrect
or the battery charge may
be low. Enter the system setup program (see
System Setup ), verify the system
configuration, and then restart the computer.
Diskette Boot
Failure
Drive A or B is present but
has failed the BIOS POST. Ensure that the drive is installed correctly in
the computer (see the "Drives" section for
your computer) and defined correctly in the
system setup program (see
System Setup ).
Check the interface cable at both ends.
DMA Error
DMA 1 Error
DMA 2 Error
Error in the DMA controller
on the system board. The keyboard or system board may need to
be replaced.
FDD Controller
Failure
HDD Controller
Failure
The BIOS cannot
communicate with the
floppy drive or hard drive
controller. Ensure that the floppy drive or the hard drive
is installed correctly in the computer (see
"Drives" section for your computer) and
defined correctly in the system setup
program (see
System Setup ). Check the
interface cable at both ends.
INTR1 Error
INTR2 Error
An interrupt channel on
the system board failed to
POST. The keyboard or system board may need to
be replaced.
Invalid Boot
Diskette
The operating system
cannot be located on drive
A or drive C. Enter the system setup program (see
System Setup ) and confirm that drive A or
drive C is properly identified.
Keyboard Error The BIOS has detected a
stuck key. Ensure that nothing is resting on the
keyboard; if a key appears to be stuck,
carefully pry it up. If the problem persists,
you may need to replace the keyboard.
KB/Interface
Error
An error occurred with the
keyboard connector. Ensure that nothing is resting on the
keyboard; if a key appears to be stuck,
carefully pry it up. If the problem persists,
you may need to replace the keyboard.
No ROM Basic The operating system
cannot be located on drive
A or drive C. Enter the system setup program (see
System Setup ) and confirm that drive A or
drive C is properly identified.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: The Dell Diagnostics works only on Dell™ computers.