Make sure none of the pins on your cable are bent. If they are then even them back out so they are aligned properly, 5 pins on each of the 3 rows. If you are still getting a white screen then go ahead and try another known working monitor on your computer. If the 2nd monitor works then you know its a problem with your original monitor. If the 2nd monitor doesn't work then you know that your video card is bad and would need to be replaced.
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