• Ask-A-Tech - Provides free technical support to user, both common and not-so-common problems.
• Protonic.com - Provides technical support to computer users for free, covers anything from hardware to html. 
• Tech Support Alert - A gateway to sites designed for the technical support profession.
• Virtual Doctor- Online tutorials for home pcs, handhelds/PDAs, hardware, operating system and software.

• Linux
  • LinuxToday
• Macintosh
  • Apple
  • MacCentral
• Windows
  • Microsoft Windows

Manufacturers typically provide a knowledge base or a knowledge archive for users to search for answers to problems or error code.

• Apple Support
• Compaq Support - Business Support Center; IT Resource Center
• Dell Support
• Gateway Tech Support
• Hewlett Packard Services and Support
• IBM Support & Downloads
• iMac Support Center @ About.com
• Lexmark
• Micron Desktop Technical Support
• Microsoft Product Support Services
• Ray's Packard Bell Web Site
• Sony

• Modem Help - A great place to find answers to modem questions.