I need to reformat my toshiba portege m400-s5032. the only way i can do this is if i get it to boot by cd when loading up. how do i get to this option screen?

Toshiba Portege M400 User Manual Fingerprint Reader Limitations
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I do not know if this will answer your specific question, but there is s site that shows how to disassemble various Toshiba laptops. Here is the link. Select your model and follow instructions.

hi this could be several reasons for not working firstly it could have been liquid damaged /spillage etc check keys are they sticking when pressed if so you will need to remove panel and remove keypad and clean the unit iff this fails check lead at base of keypad entering the board this might have come lose or even broken away .you might even try changing the keypad if all fails hope this helps you

this should be what you need
http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=DL&os=&category=&moid=1362642&rpn=PPM40U&modelFilter=M400-S4031&selCategory=2756709&selFamily=1073768662

If there is no hard drive found, there may be an issue with your hard drives firmware, you should check online for any updates then try again.

dear zy_martinez, get in to the Bios setting and look for SATA setting and disable it, now try to install again.

Sorry friend, Windows has died on you. You need to reinstall it.

after you reinstalling your keyboard cable restart your computer.....