I plugged my new LCD monitor into my video card, get a no signal input on monitor then it goes to sleep. I hooked the monitor up to my laptop and it works fine, hooked my old monitor back up to the video card and now it does not work either.
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Unfortunately, this is a standard problem, as when your laptop goes into sleep mode, it shuts off power to the secondary monitor, without giving it the signal to go into sleep mode. You could try digging around your settings, but most likely you'll just need to turn off the monitor when you're not using it.
If there is no output on the screen, check all you cables and connections and ensure they are snug and secure.
If there is still a problem, it is possible your video card is to blame.
As a diagnostic step, try hooking the monitor up to a different computer. Or hooking up another monitor to your computer. This will help eliminate bad cables and connections.
If a different computer works on your monitor, then you most likely have a bad video card. If you monitor still will not work on any computer, then you most likely have a bad monitor.
With the monitor hooked up, you'll have to use the function key to switch to the VGA output. This is usually the Fn key and the correct F-key. It'll usually have to boxes or something like that. For instance, if your F5 key had 2 boxes on it, hit Fn-F5 and it should start outputting signal to your monitor.
You need to change the input signal, get into the menu on your monitor and change the signal from rgb to dvi, hdmi or vga dipending on what cable you using for connection.
There is NO rgb connector on that monitor
My friend just purchase this monitor yesterday. When she plugged it in to the back of the tower she received the same prompt u have mentioned. I was able to repair it because she simply did not realize that I had installed a new graphics card into her pc a few months ago. When u do this, you have to hook your monitor into the area where the new graphics card was installed. You can not plug your monitor into the same onboard card that u have previously plugged your monitor into.
Let me know, if by chance, u did install a new graphics card.
Hope this was helpful :)