The logo of a Dell laptop computer is pictured in Pasadena, California July 17, 2013. Prospects of Dell Inc founder Michael Dell and private equity firm Silver Lake taking the world's No. 3 PC maker private grew more uncertain on Wednesday, a day before a scheduled shareholder vote on their $24.4 billion (16 billion pounds) offer. REUTERS/Mario Anzuoni (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY)