Dell has tried to put those problems behind it. In 2005, it announced it was taking a $300 million charge related, in part, to fixing and replacing the troubled computers. Dell set aside $100 million this month to handle a potential settlement with the Securities and Exchange Commission over a five-year-old investigation into its books, which will most likely result in federal accusations of fraud and misconduct against the company’s founder, Michael S. Dell.

Image Michael S. Dell, Dell’s founder and chairman, presented the model of computer involved in the lawsuit in 2002. Credit... Tsugufumi Matsumoto/Associated Press

The problems affecting the Dell computers stemmed from an industrywide encounter with bad capacitors produced by Asian PC component suppliers. Capacitors are found on computer motherboards, playing a crucial role in the flow of current across the hardware. They are not meant to pop and leak fluid, but that is exactly what was happening earlier this decade, causing computers made by Dell, Hewlett-Packard, Apple and others to break.

According to company memorandums and other documents recently unsealed in a civil case against Dell in Federal District Court in North Carolina, Dell appears to have suffered from the bad capacitors, made by a company called Nichicon, far more than its rivals. Internal documents show that Dell shipped at least 11.8 million computers from May 2003 to July 2005 that were at risk of failing because of the faulty components. These were Dell’s OptiPlex desktop computers  the company’s mainstream products sold to business and government customers.

A study by Dell found that OptiPlex computers affected by the bad capacitors were expected to cause problems up to 97 percent of the time over a three-year period, according to the lawsuit.

As complaints mounted, Dell hired a contractor to investigate the situation. According to a Dell filing in the lawsuit, which has not yet gone to trial, the contractor found that 10 times more computers were at risk of failing than Dell had estimated. Making problems worse, Dell replaced faulty motherboards with other faulty motherboards, according to the contractor’s findings.

But Dell employees went out of their way to conceal these problems. In one e-mail exchange between Dell customer support employees concerning computers at the Simpson Thacher & Bartlett law firm, a Dell worker states, “We need to avoid all language indicating the boards were bad or had ‘issues’ per our discussion this morning.”

In other documents about how to handle questions around the faulty OptiPlex systems, Dell salespeople were told, “Don’t bring this to customer’s attention proactively” and “Emphasize uncertainty.”