Why my LCD monitor backlight turns off?

Question

As long as I used my VGA cable, my LCD monitor worked fine. But when I switched to my DVI cable, sometimes my monitor turns off. When it happens the power light still on, the screen is dark but the very darkened images can be seen in certain angles in certain circumstances, so I supposed that just the backlight has turned off. I presume it's the cable or the connectors fault, but I am asking here if you had a similar experience, and if the only solution is to buy a new cable.

My monitor has both connections (VGA and DVI) but my video card has only DVI. So when I used the VGA cable I used with an adapter between it and the video card.

** UPDATE ** It wasn't the cable. I switched back to my old VGA cable and it is still with problems.

Answer 1

Are you sure there is no setting in your OS that controls backlight? If Vista/7, try checking the powersaving feature to make sure nothing is dimming backlight.

EDIT: So, no use. If your PC came with a DVI/VGA adapter, try it on the faulty DVI port. That way, you can rule out DVI Connector (if it works well) or DVI cable (if it doesn't).

If everything else fails, try borrowing a cable from a friend, or get a really cheap one, that at least works. If it was the cable, you can later buy a higher quality one.

This way you rule can out the most expensive parts of the issue, the monitor or the video card.