Graphics card problems?
I have a GeForce gtx640 and it has been working for a while and now whenever it is in my computer neither it or the integrated (on board) graphics will work. I just get no signal to my monitor from both of them. Please help.
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Make sure all your wires are okay - the card is plugged into the monitor, and the power supply is connected to the video card. Then check to make sure the monitor is looking for a signal in the input you connected the video card to. That should do it. If not, check your bios in the computer to make sure the graphics card is enabled. I'm betting the monitor isn't looking at the right input, though. :)
If you go thru all that and it's still not working, test your video cable. Either swap it for another video cable, or see if the system will run if you use the integrated graphics.
~Helpful ~Cindy! :)