Try the backdoor password
Dell
With a PSWD Reset Jumper
Step 1Open the access panel to the password reset jumper
if your Dell laptop has one. Consult your manual for the access panel's
location. Some access panels have a tab you slide, while others are held
in place with a screw.
Step 2Pry the plastic cover off the reset jumper with your
fingernail. The reset jumper is a small pin port labeled "PSWD" with
three pins. Put the plastic back onto the jumper over pin 1 and 2
instead of 2 and 3. Wait 90 seconds.
Step 3Pry the plastic off the reset jumper again and place
it back onto the number 2 and 3 pins. Turn the laptop on. Repeat step 2
if the password is still present. Leave the plastic clip on pins 1 and 2
for a longer duration than last time.
Without a PSWD Reset Jumper
Step 1Locate the reserve battery, also known as the CMOS
battery, if your Dell laptop is not equipped with a password reset
jumper. The CMOS battery's location varies among Dell laptop models.
Consult your manual for the battery's location on your specific Dell
laptop model. Many Dell reserve batteries are located underneath the
main laptop battery. Remove the main battery and look for a sticker
under it with instructions on removing the secondary CMOS battery.
Step 2Remove your Dell's reserve battery per the
instruction manual or sticker located under the main battery. Removing
the reserve battery resets the laptop's BIOS password. Wait 90 seconds,
then replace the reserve battery. Reconnect the main battery.
Step 3Press the "Power" button to turn the laptop on.
Here is some youtube video with your problem:
http://www.youtube.com/results?search_query=dell+bios+password+reset+laptop&oq=dell+bios+password+reset+laptop&gs_l=youtube.12...2937.2937.0.5179.1.1.0.0.0.0.44.44.1.1.0...0.0...1ac.2.rXrXigbVpXM
Try also to call dell support in your country
They will be glad to help you out.
Good luck
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