Power-On Self-Test
Note
If Quiet Boot is enabled in BIOS Setup (the default setting), press ESC during boot to see POST messages.
The POST
You should not interpret the failure of one or more POST tests as a hardware, software, or firmware failure. First, confirm the failure with a “clean” boot:
∙Remove all accessories, including RAM boards, floppy drive, port replicator, PC Cards, printer, external monitor, pointing device, and keyboard.
∙Provide “clean” ac
∙Press the
If the computer fails to boot with a clean boot, it requires repair. If an error message is displayed, confirm the problem using other diagnostic tools. Not all POST messages indicate a hardware, software, or firmware
If the BIOS detects a terminal error condition, it halts POST after issuing a terminal error beep code— up to four groups of 1 to 4 short beeps. The beep code indicates the POST routine in which the terminal error occurred. The BIOS also issues a beep code (one long tone followed by two short tones) during POST if the video configuration fails (no card installed or faulty) or if an external ROM module does not properly checksum to zero.
Beep Codes
1
Table 3-4. POST Terminal-Error Beep Codes
POST Description
One short beep before boot
Search for option ROMs. One long, two short beeps on checksum failure
BIOS ROM checksum
Test DRAM refresh
Test 8742 Keyboard Controller
RAM failure on address line xxxx
RAM failure on data bits xxxx of low byte of memory bus
RAM failure on data bits xxxx of high byte of memory bus
Check ROM copyright notice
Test for unexpected interrupts
The following table lists POST messages and explanations for reported problems. If the system fails after you make changes in BIOS Setup, reset the computer, enter BIOS Setup, and install the defaults or correct the error.
Message
0200 Failure Fixed Disk
Table 3-5. POST Messages
Description
Fixed disk is not working or not configured properly. Check to see if fixed disk is attached properly. Run Setup. Find out if the
0210 Stuck key
Stuck key on keyboard.
HP OmniBook 900 |