Eu tentaria instalar o BIOS o mais atrasado.
http://support.dell.com/support/downloads/download.aspx?c=us&cs=19&l=en&s=dhs&releaseid=R162936&SystemID=PREC_M6300&servicetag=&os=WW1&osl=en&deviceid=13067&devlib=0&typecnt=0&vercnt=10&catid=1&impid=-1&formatcnt=0&libid=1&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=218694