From TechRepublic:
Capacitors are an inexpensive little component on a PC motherboard, but they can be a costly headache for manufacturers when a whole bunch of them go bad.
Last week, Dell announced it was going to take a $300 million financial charge on its earnings to cover costs associated with the replacement of motherboards with faulty capacitors in some of its Optiplex workstations. The Dell system boards in question were manufactured from April 2003 to March 2004, according to several contract computer repair firms that are starting to replace the systems.