How do I increase the sound volume of myToshiba Satellite L755 laptop

I think what you are after is a reset of the laptop to factory default condition.

If that is the case follow instructions on this link. FAQ How do run System Recovery Support Toshiba Computers Laptops...

Otherwise if you want to reset bios password then go to the instructions at this site. Toshiba Satellite P755 Bios Password Removal

"The screen is a 15.6? diagonal widescreen TruBrite TFT display with a native resolution of 1366×768. This display is LED backlit and a 16:9 aspect ratio."
(Driving this display is the Mobile Intel HD graphics chip. It supports 64-1696MB of shared video memory. This is not the card to play video games with.")
From: http://www.bbspot.com/reviews/toshiba-satellite-l755-s5216-laptop-with-intel-pentium

Try the user manual here: http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=DL&os=&category=&moid=3025240&rpn=PSK1WU&modelFilter=L755-S5244&selCategory=2756709&selFamily=1073768663

Click the link below :----http://wikisolutions.blogspot.in/2012/02/get-free-answers.html

Available here: http://www.retrevo.com/support/Toshiba-L755-S5242-Laptops-manual/id/23969ci476/t/2/

Please Thumbs up

go to this link http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=SB&os=&category=&moid=3025242&rpn=PSK1WU&modelFilter=L755-S5246&selCategory=2756709&selFamily=1073768663

Try here: http://www.mytoshiba.com.au/support

next to the F1 key and the windows key (2nd upper key and second to last key) are two screws, usually under some covering. unscrew and lift top edge of the keyboard towards the trackpad to lay face down. Undo the wire ribbon by lifting the grey or brown tabs and remove ribbon and keyboard. Then install the new keyboard by inserting the ribbon on the place. Lock down with the tabs and put the plastic prongs (close to the space bar) into the laptop body first, and then close keyboard onto the final position. screw back in and thats all. [email protected] for any additional questions.

press and hold fn and press f11.it sounds like you activated the sticky keys