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Solve : pc not sinding signal to monitor?

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Hi
  have a problem with my HP desktop PC, problems began three days ago and when I start the computer, it starts and everything is working correctly but the signal is not sent to the screen, the screen is ok I'm using right now, I thought that maybe it is wrong the video card and got the loan from another computer but did not SOLVE the problem, I need help and want to say thank you in advance, I will say that the video card on my pc built up on the board.
Regards
Does your monitor support DVI and VGA inputs? Perhaps it's looking in the wrong mode. Quote from: samim on October 28, 2009, 11:02:54 AM
the screen is ok I'm using right now
So, you switched monitors?  Does the monitor you're using work on another computer?yes the monitor is working with another pc and monitor is ok monitor support is VGASammin, it SOUNDS like either there is a problem with your video card, your computer is trying to display a screen resolution  or refresh rate that the monitor does not support. Do you have another monitor you can try? If  so, trying changing your screen resolution to 800x600 and select the lowest frequency refresh rate. There's also the possibility that the cable is BAD. Most CRT monitors have the VGA cable hard wired, but if it's flat panel, you can try a different cable.   
hi and thank you that you had hours to help me but I will say that the monitor that I used with a PC is okay and I used the weather monitor with pc but when I turn off the computer and started again when the computer does not send signal to the monitor I have tried the pc with another monitor and changed the display card and take out all the wires and put back but it does not help, pc starts but does not send the signal to the monitor, I have changed ram but did not solve the problem. even if it is a flat screen monitor but the connector cable set firmly in the *censored* and can not be replaced but I am sure that there is not any problem with the cable and monitor. HOPE for an answer


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