Dell OptiPlex 755 - Manual (Page 14)

l Onboard SATA Hard Drive — The computer attempts to boot from the primary serial ATA hard drive. If no operating system is on the drive, the
computer generates an error message.
l Onboard or USB CD-ROM Drive — The computer attempts to boot from the CD drive. If no CD is in the drive, or if the CD has no operating system, the
computer generates an error message.
l Onboard Network Controller — The computer attempts to boot from the network controller. If no operating system is present, the computer generates
an error message.
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 Drivers 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 drive.
1. If you are booting to a USB device, connect the USB device to a USB connector.
2. Turn on (or restart) your computer.
3. When F2 = Setup, F12 = Boot Menu appears in the upper-right corner of the screen, press <F12>.
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 (see
Turning Off Your Computer ) and try again.
The Boot Device Menu appears, listing all available boot devices. Each device has a number next to it.
4. At the bottom of the menu, enter the number of the device that is to be used for the current boot only.
For example, if you are booting to a USB memory key, highlight USB Device and press <Enter>.
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 <Enter> to access the pop- up 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. (Enabled devices have a checkmark.)
5. Press <Shift><Up Arrow> or <Shift><Down Arrow> to move a selected device up or down the list.
Booting to a USB Device
Memory Key
1. Insert the memory key into a USB port and restart the computer.
2. When F12 = Boot Menu appears in the upper-right corner of the screen, press <F12>.
The BIOS detects the device and adds the USB device option to the boot menu.
3. From the boot menu, select the number that appears next to the USB device.
The computer boots to the USB device.
NOTE: If you are booting to a USB floppy drive, you must first set the floppy drive to USB in system setup (see System Setup ).
NOTE: To boot to a USB device, the device must be bootable. To make sure your device is bootable, check the device documentation.
NOTE: Write down your current boot sequence in case you want to restore it.
NOTE: To boot to a USB device, the device must be bootable. To ensure that your device is bootable, check the device documentation.