User manual DELL OPTIPLEX GX240

[. . . ] c o m Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make better use of your computer. NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death. Abbreviations and Acronyms For a complete list of abbreviations and acronyms, see the "Glossary. " ____________________ Information in this document is subject to change without notice. Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden. [. . . ] Make sure that all cables are properly connected and that all components are properly seated in their connectors and sockets. Close the computer cover, reconnect the computer and devices to their electrical outlets, and turn them on. Contact Dell for technical assistance. 2 3 4 5 So l vi n g Pro b l em s 183 w w w. The problem is resolved. Hardware Conflicts Hardware conflicts occur when the operating system detects multiple devices that are attempting to operate on the same computer resources when those resources cannot be shared between the devices. Symptoms: · · · · · · · · Computer hangs or locks up, particularly while using a specific device. Mouse pointer hangs and does not move or moves in a stuttering fashion. Messages stating that the computer is not operating at maximum performance. Nothing displays on the video monitor. To resolve hardware conflicts, remove any newly added hardware and contact the hardware manufacturer. Also see your operating system documentation. Computer Memory Problems During POST, the computer checks the computer's memory, determines the amount of installed memory, and then writes to and reads from the number of available bytes to ensure proper operation. Basic Checks: · · · · If an insufficient memory message appears, save and close any open files and exit any open application programs not in use. Reseat the memory modules. 184 So l vi n g Pro b l em s · Restart the computer. If the problem still exists after you complete the basic checks, fill out the Diagnostic Checklist as you perform the following steps. CAUTION: Before you perform this procedure, see "CAUTION: Safety Instructions. " 1 Reboot the computer. Does the RAM count displayed correctly match the actual amount of memory installed in the computer?Go to step 2. 2 Run the System Memory test group in the Dell Diagnostics. Go to step 3. 3 Turn off the computer and devices, disconnect them from their electrical outlets, wait 10 to 20 seconds, and then open the computer cover. Close the computer cover, reconnect the computer and devices to their electrical outlets, and turn them on. Does the RAM count displayed correctly match the actual amount of memory installed in the computer?Contact Dell for technical assistance. 4 5 6 System Board Problems A system board problem can result from a defective system board component, a faulty power supply, or a defective component connected to the system board. If an error message indicates a system board problem, fill out the Diagnostic Checklist as you perform the following steps. So l vi n g Pro b l em s 185 w w w. c o m CAUTION: Before you perform this procedure, see "CAUTION: Safety Instructions. " 1 Reboot the computer and run the System Board Devices test group in the Dell Diagnostics. Go to step 2. 2 Turn off the computer and devices, disconnect them from their electrical outlets, wait 10 to 20 seconds, and then open the computer cover. Make sure the power cables from the power supply are firmly connected to the connectors on the system board. Close the computer cover, reconnect the computer and devices to their electrical outlets, and turn them on. [. . . ] Because UL is one of the most widely recognized test laboratories in the United States, many customers of large manufacturers make UL approval a mandatory requirement. UPS Uninterruptible power supply. A device that allows your computer to keep running for a limited amount of time after the primary power source is lost. Typically, a UPS can also provide protection against power surges. 43 w w w. A standard way of specifying the location of an object, such as an HTML document, on the Internet. [. . . ]