Troubleshooting
6-42
TLA5000 Series Service Manual
Table 6- 3: BIOS Error messages (Cont.)
Error message Explanation
NVRAM/CMOS/PASSWORD cleared by
Jumper
NVRAM, CMOS, and passwords have been
cleared. The system should be powered off and the
jumper removed.
<CTRL_N> Pressed CMOS is i gnored and NVRAM is cl eared. User must
enter Setup.
BIOS Beep Codes
When an error occurs during the power on self test (POS T), the BIOS displays
an error message describing the problem. The BIOS also issues a beep code (one
long tone followed by two short tones) during POST if the video configuration
fails (a faulty video card or no card installed) or if an external ROM module does
not properly checksum to zero.
An external ROM module (for example, a video BIOS) can also issue audible
errors, usually consisting of one long tone followed by a series of short tones.
For more information on the beep codes, check the documentation for the device.
There are several POST routines that issue a POST terminal error and shut down
the system if they fail. Before shutting down the system, the terminal-error
handler issues a beep code (see Table 6--4) signifying the test point error, writes
the error to I/O port 80h, attempts to initialize the video, and writes the error in
the upper left corner of the screen (using both monochrome and color adapters).
If the POST completes normally, the BIOS issues one short beep before passing
control to the operating system.
Table 6- 4: Beep codes
Beeps Description
1 Refresh failure
2 Parity cannot be reset
3 First 64 K memory failure
4 Timer not operational
5 Not used
6 8042 Gate A20 cannot be toggled
7 Exception interrupt error
8 Display memory R/W error
9 Not used
To Next Page
Loading...
Need help?
General
