XPS 420 Diagnostic Lights

I have a 134 diagnostic light on my XPS 420. What should I do?
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More about diagnostic lights
  1. Did you change anything between the last time that it was working and now? That sequence isn't on the official diagnostic list, so it isn't that helpful unless I find a more detailed XPS 420 diagnostic manual than this:
  2. It was the graphic card issue. Motherboard ok. Thanks
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