IBM 689912U Hardware Maintenance Manual - Page 462

File Updates Use the World Wide Web (WWW) or the IBM BBS to download Diagnostic, BIOS Flash, and Device Driver files. For PC Series 300/700 and IntelliStation systems, the WWW address is: http://www.pc.ibm.com/us/files.html For IBM PC Servers, the WWW address is: http://www.pc.ibm.com/us/servers/ The IBM BBS can be reached at (919) 517-0001. Hardware Considerations Use the following tools to help identify and resolve hardware-related problems: Power-on self-test (POST) POST Beep codes Test programs Error messages POST does the following: Checks some basic system board operations Checks the memory operation Starts the video operation Verifies that the diskette drive is working Verifies that the hard disk drive is working Use the test programs that come with this HMM or with the system you are servicing to test the IBM components of the system and some external devices. Also, from the DOS command or from OS/2 Utilities, use the CHKDSK command to check and repair hard disk data allocation errors. Error messages generated by the software, (the operating system or application programs), generally are text messages, however, error messages can be text, numeric, or both text and numeric. Any time there is an error message indicating a problem with the system, follow the General Checkout procedures in this HMM to resolve the problem. Basically, there are five types of error messages: POST error messages are displayed when the POST finds problems with the hardware or detects a change in the hardware configuration. POST Beep codes are sounds emitted from the speaker if the POST finds a problem. One beep indicates the POST completed successfully. Multiple beeps indicate a problem was found. 452 IBM PC 300/700, IntelliStation Series HMM