Acer extensa 4220. Power is available but screen blank

SOURCE: can't find the audio driver for my acer extensa 4220

http://support.acer-euro.com/drivers/notebook/ex_4220.html

here u can find driver...

SOURCE: acer extensa 4220 wireless problem

In your Start menu search type Device Manager. Open DM and look for your 802.11 Wireless LAN Card. Does it have a next to it? Double click it, what is the "Device status" listed on the "General" tab?

Go to the "Driver" tab and click "Update Driver..." Choose "Search automatically for updated driver software." If it says that you have the best drivers already installed, uninstall the driver from there and try to update again.

You can also install drivers from your recovery discs, or download them from the manufacturer's website.

SOURCE: cant get into safe mode. tried toggling f8/f7 together but nothing

the key to getting into safe mode....tapping F8 (only that key) super fast, not stopping until you hear a beep...and see the option to boot into safe mode.  The most common reason that it will not work is that it is not pressed fast enough or early enough.  You will know that you missed your chance if you see the windows loading screen......start pressing it right away when you restart your computer and don't stop pressing F8 until you see the black screen with the white letters giving you the option to boot into safe mode.  
Good Luck!

SOURCE: acer extensa 4220 bios password how to remove or

Actually you can clear the BIOS password by resetting the CMOS jamper. If you are familiar with CMOS jamper it is easy for you. Open your laptop with the use of screw driver. Once you are already open it locate the CMOS jamper near the CMOS battery at the south bridge of your laptop motherboard. Remove the jamper with in 5 seconds after that reinsert and trun on your laptop.