I'm just guessing that your monitor is similar to mine in that the light blinks yellow when the PC is off and turns green when turned on. You might try disconnect/reconnect with both ends of the power cord and the same at the VDOCard. Make sure there are no bent pins in the monitor cord and it can't hurt to blow them out with air. If that does't help I would find a friend with a PC who can test your monitor with their PC. At least you will have a good idea of which part you need.
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what is the make and model of the monitor ?
Robert
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