sapphire hd 7750 low prfile black screen after 2 weeks

after i installed the hd 7750 i was really happy with it until one day (after 2 weeks) i restarted my computer and all the screen was black. (the monitor works) I decided to take out the card and plug my monitor into the integrated card and now everything works. (i have windows 8.1)

What is the problem????
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More about sapphire 7750 low prfile black screen weeks
  1. i was the problem with the card
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