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To unlock your BIOS you have to remove your BIOS battery for few minutes which is onboard, then replace the BIOS battery again on the motherboard will not only reset the BIOS password to default but will put all the BIOS settings to default. For which you will have to reconfigure your BIOS settings, but remember any wrong setting in the BIOS may damage your laptop.
Restart the computer and keep on tapping F8 keep, select Safemode with Netwroking. Once the computer is booted check for wireless network is detected. If yes, then the scurity program is blocking wireless, change the settings.
This problem arises by uninstalling or deleting some part of audio driver, or audio supporting software.Try to restore the system to earlier time,when system worked normally. i think it solves your problem.if it is not leave a feedback ,we will glad to assist you