Dell Inspiron 570 (Late 2009) - Manual (Page 36)

8. Connect your computer and devices to electrical outlets, and turn them on.
Clearing CMOS Settings
1. Follow the procedures in Before You Begin .
2. Remove the computer cover (see Removing the Computer Cover ).
3. Reset the current CMOS settings:
a. Locate the 3-pin CMOS reset jumper on the system board (see System Board Components ).
b. Remove the jumper plug from the CMOS reset jumper pins 2 and 3.
c. Place the jumper plug on the CMOS reset jumper pins 1 and 2 and wait for approximately five seconds.
d. Remove the jumper plug and replace it on the CMOS reset jumper pins 2 and 3.
Inspiron 560
Inspiron 570
NOTE: The computer must be disconnected from the electrical outlet to clear the CMOS setting.