Boot failures can be hard to troubleshoot. One particularly misleading error message you might see is "Invalid partition table—a disk read error occurred." This usually doesn't mean your partition table is corrupted however, what it usually means in fact is that you've installed a new disk into your system and its configuration isn't correct for your type of system. Usually removing the problem disk will resolve the issue.
Mitch Tulloch is President of MTIT Enterprises, an IT content development company based in Winnipeg, Canada. Prior to starting his own company in 1998, Mitch worked as a Microsoft Certified Trainer (MCT) for Productivity Point International. Mitch is a widely recognized expert on Windows administration, networking and security and has written 14 books and over a hundred articles on various topics. He has been repeatedly awarded Most Valuable Professional (MVP) status by Microsoft for his outstanding contributions in supporting users who deploy Microsoft platforms, products and solutions. Mitch is also a professor at Jones International University (JIU) where he teaches graduate-level courses in Information Security Management (ISM) for their Masters of Business Administration (MBA) program. For more information see http://www.mtit.com.