Dell Precision 400 User's Guide (.pdf) - Page 32

To ensure that the system can be turned off under these circumstances, a manual intervention mechanism has been included in the software. To turn off a locked-up system, either press the power button a second time or press the reset button. NOTE: This scenario (a locked-up system with the AutoShutdown service active) is the only situation in which pressing the reset button will turn off the system without rebooting it. Dell ThermalShutdown Service The Dell ThermalShutdown service helps protect the system processor from damage due to overheating. It can also protect your system data from loss or corruption resulting from a thermal-related system shutdown. When installed, the service uses a sensor to monitor the fan status. If the fan stops rotating, the system first performs an orderly operating system shutdown and then turns itself off. During the shutdown phase, the power indicator flashes and a screen message notifies the user that the system is shutting down. If the service is unable to shut down the system within approximately 3 minutes, the system BIOS will power down the computer. CAUTION: The fan sensor is always installed and operational. If the ThermalShutdown service is not installed and the fan stops, the system turns off immediately-with no attempt to perform an orderly operating system shutdown. Bus-Mastering EIDE Drivers Bus-mastering EIDE drivers (provided for Windows 95 and Windows NT 4.0 operating systems) provide a performance improvement by off-loading certain functions from the system microprocessor during multithreaded operations. The bus-mastering driver for your operating system has been installed by Dell and is operative when you receive your computer. No further installation or configuration is needed. A backup copy of the Windows 95 driver is provided with the Windows 95 CD or diskettes. This driver will be reinstalled automatically if you reinstall Windows 95. However, the driver is disabled until you complete the steps provided in "Enabling the Windows 95 BusMastering EIDE Driver" found later in this chapter. The driver for Windows NT 4.0 has also been copied to your hard-disk drive in diskette-image form. If you need to reinstall or remove this driver, you can do so as described in the following subsections. Windows NT 4.0 NOTE: To install the bus-mastering EIDE driver for Windows NT 4.0, you must have a mouse connected to the system and Windows NT 4.0 must already be installed on the hard-disk drive connected to the primary EIDE channel. To reinstall the bus-mastering EIDE driver for Windows NT 4.0, perform the following steps: 1. If you have not already done so, use the Dell DiskMaker to make a diskette copy of the Dell busmastering IDE drivers diskette image on your hard-disk drive. The Dell DiskMaker is available through the Dell Accessories program folder. For more information, refer to the online help provided in the Dell DiskMaker program. 2. If an older bus-mastering EIDE driver is already installed, you must remove the older driver before installing the new driver. For instructions, see "Removing the Windows NT 4.0 Bus-Mastering EIDE Driver" found in the next subsection. 3. Start the Windows NT operating system. If you are already running Windows NT, close any open documents or application programs. 4. From the Start menu, select Settings and then Control Panel. 5. From the Control Panel, double-click SCSI Adapters. 6. From the SCSI Adapters window, select the Drivers tab and then the Add button. 7. From the Install Driver window, click Have Disk. 2-4 Dell Workstation Midsize Systems User's Guide