Dell numbered diagnostic leds

got an old dell which will not boot, there are leds on back numbered1234, 1 and 3 are lit 2 and 4 are not is there a chart to tell me what the problem is many thanks
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  1. What model do you have? I have a XPS400 and 1&3 is a memory error.

    Just google dell diagnostic lights with the model number and it should tell you the codes. I have a Dell XPS 400 and When I searched for the lights I found it in the troubleshooting documentation.

    Here is the link for the XPS 400.

    Dell may use the same codes for all computer But I am not sure.

    Hope this helps
  2. Best answer selected by technocretin.
  3. both answers were helpful and it was the memory module that had come unseated, now works fine

    thanks to both

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