How to reset the sapphire vapor-x hd 4850 red light

Have a Sapphire Vapor-X HD 4850 video card. It keeps "locking up", with screen going blank and red light on top of vid card. What's the problem, and is there a way to reset it without powering down my whole system?
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More about reset sapphire vapor 4850 light
  1. Have you connected the extra power cable?
    This could also indicate an overheating problem
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