450 DX/2 (259-5148) Troubleshooting Faxback Doc. # 2226 This document will help you correct problems you might encounter while setting up or using your computer. BLANK SCREEN: * Are the system cords plugged in securely? * Is the computer turned on? * Is the monitor turned on? * Do you need to adjust monitor brightness and/or contrast? * Are all jumpers and switches set correctly? * Are the IDE drive data and power cables connected correctly? NO KEYBOARD RESPONSE: * Is the keyboard cord plugged in correctly and securely? * Is the computer turned on? * Is the keyboard unlocked? SETUP PROBLEMS: * Are the system cords plugged in securely? * Is the power outlet operating correctly? (Check by plugging another device into the outlet.) * Are the expansion adapters properly seated? * Are all jumpers and switches set correctly? * Is all hardware information entered with the setup utility correct? * Is the battery properly installed? * Is your hard drive properly configured? OPTION NOT WORKING: * Is the option expansion adapter properly seated? * Are the system cords plugged in securely? * Are all jumpers and switches set correctly? * Did you execute the setup utility after installing the option? * Is all hardware information entered with the setup utility correct? Note: To resolve a conflict with an ISA expansion adapter that uses zero wait state operation, you can disable zero wait state operation for the on-board video controller by removing the jumper from Jumper Block J32. COMPUTER VIRUSES: A computer virus is a program intended to destroy systems by corrupting data. Diskettes, networks, and modem transfers can carry viruses. When files from an infected computer are used on another system, the virus spreads. Problems might occur as soon as the virus invades the system, or the virus might wait for a preset time before becoming active. PREVENTION: Viruses spread through contact with other systems via diskettes, modems, and networks. To protect your system: * Use virus-checking software to scan new diskettes and new files before copying or using them. * Use only write-protected master copies to make backups. Make copies after you start up with a write-protected diskette. * Start up by pressing the reset button or the power button, not by pressing ++. * Always keep a write-protected copy of a startup diskette. If a virus infects your hard drive, you can still start up with this diskette. * Keep copies of files on write-protected diskettes. * Be wary of copied or pirated software. * Do not assume that legitimate, packaged software is free of viruses. * Contact your computer dealer, an electronic bulletin board service, or your public library for more information concerning virus protection. TROUBLESHOOTING: Virus symptoms can mimic simpler hardware problems, such as those caused by loose cable connections or poor SIMM contacts. Follow the other suggestions in this section before seeking repairs. If you think your computer has virus, use current virus-scanning programs to detect recent viruses. VIDEO TROUBLESHOOTING Following are some symptoms of video problems along with possible solutions: NO DISPLAY * The video settings selected through the setup utility are not correct. * The monitor is not turned on. * Readjust the brightness and/or contrast controls. FI SETUP ERROR WHEN YOU START UP YOUR SYSTEM * The setup utility was not run correctly. * The CMOS RAM battery might need replacing. DISPLAYS ROLLS HORIZONTALLY OR VERTICALLY * Be sure to install the correct video drivers for your monitor. IMAGE IS OFFSET ON MONITOR * Adjust the monitor centering. Refer to your monitor documentation. DISTORTED IMAGES OR A BLANK SCREEN WHEN YOU RUN YOUR SOFTWARE * The software is not configured for the current video configuration. Reconfigure the software for VGA or EGA video. * The software is not compatible with the current video configuration. Set the video to a standard supported by the software. INABILITY TO DISPLAY 1024 X 768 OR 800 X 600 GRAPHICS * Run the setup utility to select the appropriate refresh rate for the 1024 x 768 and 800 x 600 graphics. * Run the VGAMODE utility to set the appropriate frequency for running your monitor at these modes. Refer to your monitor documentation for frequency information. See "VGAMODE" for information on running VGAMODE.EXE * The 256-color, 1024 x 768 mode requires 1MB of video memory. (smm 08/25/93)