Following are the various ways to clear the CMOS or NVRAM on Optiplex systems. This only covers to the GX100 series system.

Some of the systems, particularly the newer ones, allow you to reload the system defaults through the System Setup program. This does not clear the NVRAM however, it only puts the settings back to the initial configuration.

To carry out this procedure, in System Setup, you would press the Alt-F key combination. You can also reset the defaults through the Maintenance screen.


For all systems, even those older than the GX100, the CMOS/NVRAM can be cleared by the following procedure:

The computer must be disconnected from the electrical outlet to clear the CMOS setting.

Remove the computer cover.
Locate the CMOS battery on the system board.
Note the orientation of the battery, usually the plus side is up, and remove it.
Wait for 3 to 5 minutes for the CMOS to clear.
Replace the battery in the socket.
Replace the computer cover.
Plug the system and devices back into the electrical outlets and turn them on.


Clearing the NVRAM for the; 330, 755, 745c, 745, 740, GX620, GX520, GX280, SX280

By Jumper:

Turn off the computer and disconnect the power cable from the electrical outlet.
Remove the computer cover.
Reset the current CMOS settings:
Locate the password (PSWD) and CMOS (RTC_RST) jumpers on the system board.
Remove the jumper plug from the PSWD jumper pins.
Place the password jumper plug on the RTC_RST pins and wait approximately 5 seconds.
Remove the jumper plug from the RTC_RST pins and place it back on the password pins.
Close the computer cover.
Attach the computer stand, if used.
Connect your computer and devices to electrical outlets and turn them on.


Clearing the NVRAM for the; 320, 210L

By Jumper:

Turn off the computer and disconnect the power cable from the electrical outlet.
Remove the computer cover.
Locate the 3-pin CMOS jumper (RTCRST) on the system board.
Remove the jumper plug from pins 1 and 2.
Place the jumper plug on pins 2 and 3 and wait approximately 5 seconds.
Replace the jumper plug on pins 1 and 2.
Close the computer cover.


Clearing the NVRAM for the; 170L, GX50, GX400, GX150, GX115, GX100

By Battery Removal:

Turn the system off.
Remove the computer cover.
Disconnect the power and any devices from the computer.
Remove the battery from the socket, being careful to note which side of the battery faces up.
Leave the battery out of the socket for a few minutes.
Reinsert the battery into the socket with the side labeled + facing up and snap it into place.
Connect the computer and devices to electrical outlets and turn them on.
Reboot the system and enter BIOS to confirm changes.

By System Setup:

Light the three keyboard lights. Press Alt E until you hear the beep. Save and reboot.


Clearing the NVRAM for the; 160L, SX270, GX270, SX260, GX60, GX260, GX240

By Jumper:

Turn off the computer and disconnect the power cable from the electrical outlet.
Remove the computer cover.
Reset the current CMOS settings:
Locate the password (PSWD) and CMOS (RTC_RST) jumpers on the system board.
Remove the jumper plug from from the PSWD jumper pins.
Place the password jumper plug on the RTC_RST pins and wait approximately 5 seconds.
Remove the jumper plug from the RTC_RST pins and place it back on the password pins.
Close the computer cover.
Attach the computer stand, if used.
Connect your computer and devices to electrical outlets and turn them on.

By System Setup:

Light the three keyboard lights. Press Alt E until you hear the beep. Save and reboot.


Clearing the NVRAM for the; GX300, GX200

By Jumper:

Turn off the computer and disconnect the power cable from the electrical outlet.
Remove the computer cover.
Locate the 3-pin CMOS jumper (RTCRST) on the system board.
Remove the jumper plug from pins 1 and 2.
Place the jumper plug on pins 2 and 3 and wait approximately 5 seconds.
Replace the jumper plug on pins 1 and 2.
Close the computer cover.

By System Setup:

Light the three keyboard lights. Press Alt E until you hear the beep. Save and reboot.


Clearing the NVRAM for the; GX110

By Battery Removal:

Turn the system off.
Remove the computer cover.
Disconnect the power and any devices from the computer.
Remove the battery from the socket, being careful to note which side of the battery faces up.
Leave the battery out of the socket for a few minutes.
Reinsert the battery into the socket with the side labeled + facing up and snap it into place.
Connect the computer and devices to electrical outlets and turn them on.
Reboot the system and enter BIOS to confirm changes.

Message Edited by DELL-FAQ on 10-17-2007 08:51 AM