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1. Using another computer, load up your Internet browser. Go to this website, and write down the code shown on the locked computer.
2. Pay the Small fee, and then enter the code you have written down. A few codes will be provided, so try them all until you find the one that works.
This also works for locked HDD drives, so make sure you take a look.
3. You're computer is now unlocked! Keep the backup password handy, this will be invaluable if you locked out of you're pc again.
Method 2 of 3: Reset Jumpers to Clear a CMOS Password
1. Unplug the computer and remove all peripheral connections like monitors and printers.
2. Reduce electrostatic discharge (ESD). Wear a wrist strap to eliminate ESD, or make sure 1 hand is holding a metal piece while you are working inside the computer. Wear rubber soled shoes, and stand on an ESD mat if possible.
3. Open the computer. Locate the CMOS jumper. The jumper will usually consist of 3 pins, though on the rare occasion, 2 pins (requiring you to supply the jumper itself). This often is labeled with "clear," "cmos," "password" or some abbreviation that indicates it is the password jumper. It is usually located near the CMOS battery, or processor. In laptops, it is often a dipswitch at the bottom of the laptop. Consult your motherboard documentation to find the location if you are unsure of where it is located.
4. Make note of which pins the jumper covers. Remove the jumper. Reinstall it so that it covers the pin that is currently not covered. For example, if it covers pins 2 and 3, change it so that it covers pins 1 and 2.
5. Reassemble the computer, and re-connect the power. Turn on the computer. Check to see that the password is cleared.
Clear BIOS Password Step 6.jpg
6. Turn off the computer. Disconnect the power cord, and open it. Change the jumper settings back to the original position.
Method 3 of 3: Other Methods to Clear a BIOS Password
Clear BIOS Password Step 7.jpg
1. Search online for generic CMOS passwords. Older computers sometimes have a generic password set by the manufacturer. To find one, search for the name of your manufacturer. Keep in mind that the computer password may have changed or no longer is in use.
Clear BIOS Password Step 8.jpg
2. Download a utility to bypass the computer password. These can be found online and loaded with a CD or floppy disk.
Clear BIOS Password Step 9.jpg
3. Take out the CMOS battery. Leave it out for longer than 5 minutes, and then reseat it. This will clear all BIOS settings, including the password. Keep in mind that you will have to reset the BIOS date, time and other settings.
Clear BIOS Password Step 10.jpg
4. Contact the manufacturer. Find information about the motherboard, and call either the motherboard or computer manufacturer. They can tell you whether there is a CMOS default password or solder beads that must be jumped.
open your computer and find the pins(three side by side) near bios battary in which two pins are connected with one jumper & one is free, sort one pin with that free jumper & power on computer after some time power off & set jumper as previous.
If you've forgotten you BIOS password you can easy access the BIOS by reset the CMOS battery and jamper.
The BIOS password is
stored in CMOS memory that is maintained while the PC is powered off by
a small battery, which is attached to the motherboard. If you remove
this battery, all CMOS information (including the BIOS password) will
be lost. You will need to re-enter the correct CMOS setup information
to use the machine. The machines owner or user will most likely be
alarmed when it is discovered that the BIOS password has been deleted.
On some motherboards, the battery is soldered to the motherboard,
making it difficult to remove. If this is the case, you have another
alternative. Somewhere on the motherboard you should find a jumper that
will clear the BIOS password. If you have the motherboard
documentation, you will know where that jumper is.
If not, the jumper
may be labeled on the motherboard. If you are not fortunate enough for
either of these to be the case, you may be able to guess which jumper
is the correct jumper. This jumper is usually standing alone near the
battery. If you cannot locate this jumper, you might short both of the
points where the battery connects to the motherboard.
This sounds like your battery may be bad or not locked into place fully. Also on the mother board there is a cmos jumper that is used to clear your bios check to make sure the jumper is set correctly an also inspect the jumper to make sure it will make good contact to the jumper posts. Good luck I hope this helps. Also when you set the time in your bios make sure to exit with f 10 key or whatever the save and exit key is for you bios.
In the model 280 Optiplex, remove the jumper, they have two pins only, turn on the computer, wait for 1 minute. The jumper is located close to the power plug, in the right side, you read PWD, theres is it, i did it and working fine...