Http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=DL&os=&category=&moid=2060176&rpn=PSU44U&modelFilter=U405-S2856&selCategory=3&selFamily=1073768663
if it still doesnt work:
your OS might be XP service pack 2, you may need to upgrade to service pack 3 or download realtech software (this is what worked for me, i don't know about Toshiba laptops, mine was an acer) because, some of the new laptop sound systems do not support service pack 2 sound drivers. I had the same problem
Try this place for drivers www.softpedia.com
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