NEED BIOS BACKDOOR PASSWORD FOR HP PROBOOK 6540b. Have tried all types of bios resets, no luck.

NEED BIOS BACKDOOR PASSWORD FOR HP LAPTOP PROBOOK 6540b. Have tried all types of bios resets, doesn't work.
The password stay's no error code for entering wrong ones.

Hi,
I too have been pulling my hair out with this problem on the 6540B. However after 2 days of various driver combinations I've finally found a working fix. I don't have the luxury of reinstalling Windows XP as the machine is custom configured with apps which will take over a week to configure again.
If you've got no audio it's probably because you've installed the IDT High Def Audio Driver. You may have tried a whole bunch of other options also to try and rectify the problem as I did.
The solution is fairly simple:
Goto to add/remove programs and remove "SoundMax".
Reboot
The audio driver may try to reinstall on boot up... allow it to install. It will still not work and will still show exclamation mark against IDT driver in Device Manager.
Goto run... then type regedit and hit enter. Windows registry opens.
Goto My Computer>HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>
Delete the WHOLE KEY for AEAudio and then exit regedit
Go to device manager and uninstall the IDT High Def Audio device from Device Manager
Then using the original HP Application and Driver Recovery DVD supplied with the notebook, run the autoplay, choose Hardware Enabling Drivers, tick only the IDT High Def Audio driver and follow the installation instruction on screen. You will be prompted to reboot after which Windows will find new hardware. The IDT will install itself and you will find that the sound works!
Good Luck!
For those that cannot find their original disk, the IDT Audio Driver from the original disk is available at http://tinyurl.com/IDTAudio6540b or http://www.4shared.com/file/RxXn5afj/IDTAUDIO.html

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