User manual HP PRESARIO 2500 Reference Guide

[. . . ] Compaq Notebook Series Reference Guide Notice © 2002 Hewlett-Packard Company. Microsoft, MS-DOS, and Windows are trademarks of Microsoft Corporation in the U. S. All other product names mentioned herein may be trademarks of their respective companies. This product incorporates copyright protection technology that is protected by method claims of certain U. S. [. . . ] This will wake the display if it is in Display-off mode. · Press Fn+F5 in case the internal display was disabled. (Do this three times to return to the state you started from. ) · If the notebook is cold, allow it to warm up. If the screen is difficult to read · Try setting the display resolution to its default setting of 1024 × 768 or higher, depending on your model. Select Start > Control Panel > Appearance and Themes, Display. · Try adjusting the size of the desktop icons and labels. 68 Reference Guide Troubleshooting and Maintenance Troubleshooting Your Notebook If an external display does not work · Check the connections. · Press Fn+F5 in case the external monitor was disabled. (Do this three times to return to the state you started from. ) · The external monitor may not be detected. In the BIOS Setup utility, try setting Video Display Device to Both in the System Devices menu. · If you're using a TV connected to the S-video port, you must activate the TV. Hard disk drive problems If the notebook hard drive doesn't spin · Make sure the notebook has power. If necessary, connect the AC adapter, and make sure it is fully plugged into a power source and into the back of the notebook. · Remove and reinsert the hard drive. If the hard disk makes a buzzing or whining noise · Back up the drive immediately. · See whether the noise is coming from elsewhere, such as from the fan or a PC Card drive. If files are corrupted · Open My Computer, and the disk you want to scan. Select the Check Now box under the Error-checking section of the Tools tab. · Run the virus-scanning program. · If necessary, you can format the hard disk and reinstall the original factory software using the QuickRestore System Recovery CD. Reference Guide 69 Troubleshooting and Maintenance Troubleshooting Your Notebook Heat problems Your notebook normally gets warm during routine operation. If the notebook gets abnormally hot · Always set the notebook on a flat surface, so that air can flow freely around and underneath it. · Make sure the air vents on the bottom and sides of the notebook are clear. · Keep in mind that games and other programs that drive CPU usage toward 100 percent can increase the notebook temperature. Infrared problems By default, the infrared port is not enabled, so you must enable it before you can use it. If you have problems with infrared communications · Make sure the line between the two infrared ports is not blocked, and that the ports face each other as squarely as possible. [. . . ] The application software shall be set to operate within the following limits for compliance with Telecom's specifications: The S0 register must contain a value of 0 for no auto-answer or a value of 2 for auto-answer. The S6 register must contain a value of 2, 3, 4, 5, 6, or 7. The factory default of 2 is recommended. The S7 register must contain a value less than 90. [. . . ]