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  2. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    If you're having problems reading and retrieving your AOL Mail, the following troubleshooting steps: Use AOL Basic Mail. AOL Basic Mail gives you a way to see your emails in a simpler layout. This can often help when you're having problems retrieving mail on a slower connection speed. Reset your web settings

  3. Error code - Wikipedia

    en.wikipedia.org/wiki/Error_code

    Car owners can make use of an on-board diagnostics scanner or an owner's manual to identify the meaning of a trouble code. Five-digit diagnostic trouble codes typically consist of one letter and four numbers (e.g. P0123). [citation needed]

  4. Troubleshooting - Wikipedia

    en.wikipedia.org/wiki/Troubleshooting

    Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.

  5. User guide - Wikipedia

    en.wikipedia.org/wiki/User_guide

    Most user guides contain both a written guide and associated images. In the case of computer applications, it is usual to include screenshots of the human-machine interface(s), and hardware manuals often include clear, simplified diagrams. The language used is matched to the intended audience, with jargon kept to a minimum or explained thoroughly.

  6. Troubleshoot a broadband internet connection - AOL Help

    help.aol.com/articles/troubleshooting-a...

    Check if you can visit other sites with a different browser - If you can go to another site, the problem may be associated the browser you're using. If you don't have another browser, download a supported one for free. 2. Check the physical connection - A loose cable or cord can often be the cause of a connection problem. Make sure everything ...

  7. HTTP 402 - Wikipedia

    en.wikipedia.org/wiki/HTTP_402

    The HTTP 402 status code is typically used in e-commerce and subscription-based systems where access to content or services is restricted until the user completes a payment.

  8. Linear–quadratic regulator - Wikipedia

    en.wikipedia.org/wiki/Linear–quadratic_regulator

    The case where the system dynamics are described by a set of linear differential equations and the cost is described by a quadratic function is called the LQ problem. One of the main results in the theory is that the solution is provided by the linear–quadratic regulator ( LQR ), a feedback controller whose equations are given below.