TYAN THUNDER I840 User Manual page 39

The table below can be used to troubleshoot error messages.
Error Message
8042 Gate-A20 Error
Address Line Short!
C: Drive Error
C: Drive Failure
Cache Memory Bad, Do
Not Enable Cache!
CH-2 Timer Error
CMOS Battery State Low
CMOS Checksum Failure
CMOS System Options Not
Set
CMOS Display Type Mis-
match
CMOS Memory Size Mis-
match
CMOS Time and Date Not
Set
D: Drive Error
D: Drive Failure
Diskette Boot Failure
Display Switch Not Proper
Thunder i840 S2520
Possible Reason For Error
Gate A20 on the keyboard controller
(8042) is not working.
Error in the address decoding circuitry.
No response from drive C:
No response from hard disk drive C:
Cache memory is defective.
An AT system has two timers. There is
an error in timer 2.
CMOS RAM is powered by a battery.
This error message indicates low battery
power.
CMOS RAM checksum is different than
the previous value.
The values stored in the CMOS RAM
have been destroyed.
The video type set in CMOS RAM does
not match the type detected.
The amount of memory found by AMI-
BIOS is different than the amount in
CMOS RAM.
The date and time need to be set.
No response from drive D:
No response from drive D:
The boot diskette in drive A: cannot be
used to boot the system.
Some systems require a video switch to
be set to either color or monochrome.
Possible Solution
Replace the 8042
Return the board to dealer
for a replacement.
Check the C: hard disk type
in CMOS Setup.
Replace the drive
Return the board to dealer
for a replacement.
Return the board to dealer
for a replacement.
Replace the battery
Run CMOS Setup
Run CMOS Setup
Run CMOS Setup
Run CMOS Setup
Run CMOS Setup
Check the hard disk type in
CMOS Setup
Check the hard disk type in
CMOS Setup
Use another boot disk
Turn system off, set switch
properly, then power back on
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