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"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models: 1683, 1685, 1687, 1688, and 1690
United States June 27, 2004
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Maintenance & Service Guide for Presario 1600 Series
(Models 1683-1694)
| Home Page | Notice | Preface | Product Description | Troubleshooting |
Illustrated Parts Catalog |
Removal & Replacement Procedures | Specifications | Pin Assignments | Battery
Pack Operations
Troubleshooting
Running POST
To run POST, complete the following steps:
Turn off the computer, then turn on the computer.
If POST does not detect any errors, the computer will not beep. This indicates successful
completion of POST test. POST has run successfully and boots from the hard drive (or
from a bootable diskette if one is installed in the diskette drive).
If POST detects errors, the errors are indicated by screen and/or audible messages. Refer
to "Power-On Self-Test (POST) Codes" in the tables for a list of POST codes and their
relevant descriptions.
NOTE:
If the system is not functioning well enough to run POST, or if the display is not
functioning well enough to show POST error messages, refer to the
Troubleshooting tables.
NOTE:
The following routines are sorted by their test point numbers assigned in the BIOS
code. Their actual orders as executed during POST can be quite different.
Code Beeps POST Routine Description
02h Verify Real Mode
03h Disable Non-Maskable Interrupt (NM)
04h Get CPU type
06h Initialize system hardware
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