l Hard Drive — The computer attempts to boot from the primary hard drive. If no operating system is on the drive, the computer attempts to boot from the next bootable device in the boot sequence. l Optical Drive — The computer attempts to boot from the optical drive. If no optical media is in the drive, or if the media has no operating system, the computer attempts to boot from the next bootable device in the boot sequence. l Integrated NIC — The computer attempts to boot from the integrated network adapter. l USB Device — Insert the memory device into a USB port and restart the computer. When F12 = Boot Menu appears in the upper-right corner of the screen, press . The BIOS detects the device and adds the USB flash option to the boot menu. l Disabled — Disables the particular boot device. The computer attempts to boot from the next bootable device in the boot sequence. Changing Boot Sequence for the Current Boot You can use this feature, for example, to tell the computer to boot from the CD drive so that you can run the Dell Diagnostics on the Driver and Utilities media, but you want the computer to boot from the hard drive when the diagnostic tests are complete. You can also use this feature to restart your computer to a USB device such as a floppy drive, memory key, or CD-RW drive. 1. If you are booting to a USB device, connect the USB device to a USB connector (see the Back View Features in your Setup Guide). 2. Turn on (or restart) your computer. 3. When the DELL logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft Windows desktop, then shut down your computer and try again. 4. At the Boot Device Menu, use the up- and down-arrow keys or press the appropriate number on the keyboard to highlight the device that is to be used for the current boot only, and then press . For example, if you are booting to a USB memory key, highlight USB Flash Device and press . Changing Boot Sequence for Future Boots 1. Enter system setup (see Entering System Setup). 2. Use the arrow keys to highlight the Boot Sequence menu option and press to access the menu. 3. Press the up- and down-arrow keys to move through the list of devices. 4. Press the spacebar to enable or disable a device. 5. Press plus (+) or minus (–) to move a selected device up or down the list. NOTE: To boot to a USB device, the device must be bootable. To ensure that your device is bootable, check the device documentation. NOTE: An error message is generated only after the computer attempts to boot from every device in the boot sequence and no operating system is found. NOTE: If you are booting to a USB floppy drive, you must first set the floppy drive to OFF in system setup (see System Setup). NOTE: Keyboard failure may result when a key on the keyboard is held down for an extended period of time. To avoid possible keyboard failure, press and release in even intervals until the Boot Device Menu appears. NOTE: To boot to a USB device, the device must be bootable. To ensure that your device is bootable, check the device documentation. NOTE: Write down your current boot sequence in case you want to restore it. Back to Contents Page Back to Contents Page Replacing the System Board Dell™ XPS™ 625 Service Manual 1. Follow the procedures in Before You Begin. 2. Remove the computer cover (see Replacing the Computer Cover). 3. Remove the processor heat sink (see Replacing the Processor Heat Sink). 4. Remove all the expansion cards (see Removing PCI and PCI Express Cards). 5. Remove any additional components that may restrict access to the system board. 6. Disconnect all cables from the system board. 7. Remove the 10 screws that secure the system board to the chassis. 8. Carefully, lift the system board out of the computer. 9. Transfer components from the existing system board to the replacement system board, if applicable. 10. Orient the system board by aligning the screw holes on the system board with the screw holes on the chassis. 11. Replace the 10 screws to secure the system board to the chassis. 12. Replace the processor heatsink (see Replacing the Processor Heat Sink). 13. Replace any expansion cards that you removed (see Installing PCI and PCI Express Cards). 14. Replace any additional components that you removed from the system board. WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at WARNING: The processor heat sink can get very hot during normal operation. Be sure that the heat sink has had sufficient time to cool before you touch it. CAUTION: Carefully note the routing and location of each cable before you disconnect it, so that you are sure to re-route cables correctly. An incorrectly routed or a disconnected cable could lead to computer problems. CAU...
