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Am having an acer aspire 4720 laptop.It contains an phoniex security. So am unable to enter into bios settings due to the unknown password.So how can i get or remove the password.And one more problem is optical drive is not working.Please help me.

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I'm googling it, but just to be sure, could you give us the version of bios, if you know it. –  ldigas Feb 14 '10 at 17:17

3 Answers 3

For starters (see my comment) try some of these backdoor passwords for phoenix bios. It's a longshot, but cannot hurt.

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If you just want to enter into BIOS, why not remove the CMOS battery, set the jumper setting to clear and then again replace the CMOS battery and reboot?

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That was my original answer, but I deleted it after I found no actual confirmation that the motherboard has one that can be removed. Some reports say that the battery is soldered onto the motherboard. The Acer service manual fails to mention the location of the RTC battery at all and I do not think that it has a jumper for resetting the BIOS password. –  Kez Feb 15 '10 at 14:41
If you short-circuit the right things it will have same effect as removing CMOS battery. But I can't remember what to short-circuit. I did this quite long time when I forgot my bios pass. –  egon Feb 15 '10 at 14:47

This information is intended for experienced users. It is not intended for basic users, hackers, or computer thieves. Please do not try any of following procedures if you are not familiar with computer hardware. I'll not be responsible for the use or misuse of this information, including personal injury, loss of data or hardware damage. So use it at your own risk.

A. By Using the Motherboard Jumper:

In most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.

Almost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don't have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.

When you find the jumper, look carefully. There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.

Make sure to turn the PC off before opening the cabinet and resetting the jumper.

B. By Using Software:

I have found that BIOS/CMOS Password Recovery Tool is the most effective.: BIOS/CMOS Password Recovery Tool is a program that works instantly to remove any lost or forgotten BIOS/CMOS password. Simply boot your PC to DOS and execute the program, and get access to forgotten BIOS/CMOS passwords in just seconds

BIOS/CMOS Password Recovery Tool Service: http://www.biospasswordrecovery.com/

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