Dell OptiPlex 745c (Early 2007) - Manual (Page 14)

3. From the boot menu, select the number that appears next to the USB device.
The computer boots to the USB device.
Floppy Drive
1. In system setup, set the Diskette Drive option to USB.
2. Save and exit system setup.
3. Connect the USB floppy drive, insert a bootable floppy, and re-boot the system.
Jumper Settings
Clearing Forgotten Passwords
1. Follow the procedures in Before You Begin .
2. Locate the 2-pin password jumper (PSWD) on the system board, and remove the jumper to clear the password. See Jumper Settings .
3. Replace the computer cover (see Replacing the Computer Cover ).
4. Connect your computer and monitor to electrical outlets, and turn them on.
Mini Tower
Jumper Setting Description
PSWD Password features are enabled (default setting).
Password features are disabled.
RTCRST The real-time clock has not been reset.
The real-time clock is being reset (jumpered temporarily).
jumpered unjumpered
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: This process erases both the system and administrator passwords.
NOTE: The MEBx password is reset using the RTCRST jumper to clear CMOS and unprovision AMT.