我也说一句When an error occurs in the system of your computer,the system may have serious problems – or it may have a minor problem that you can quickly solve with a little effort.Naturally,you can always take your entire system to your dealer,waiting for a period of time and spending a fair sum of money.In the end you may get it repaired,but you may discover that nothing was wrong; you may spend as much to discover the problem as to fix it.So spending a little time learning how to figure out problems may save you money,time and effort. Consider a problem.Suppose the display of your computer moves horizontally (水平地) or vertically(垂直地),the cause may be the screen controls are not set correctly.Like television sets,most computer monitors have knobs(按钮) to adjust screen movement.So you just have to adjust the computer controls.This task is very easy. Another example.When you press a key,nothing happens.One cause may be a program is still executing and does not require input.So you just wait until processing ends.Perhaps the keyboard-computer link is broken.Check the cable connection.Another cause may be Scroll-Lock or Num-Lock is set inappropriately for the software application,you just press the Scroll-Lock or Num-Lock key once and then retry the application.
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