No signal to monitor.

Sounds like the video card inside the computer is bad. If the monitor was bad it would not be able to display the No Input Signal. To make sure, try connecting another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays the same No Input Signal message then your video card is bad. If the Borrowed monitor displays and works ok, then your original monitor or lcd screen is bad.

If you have a laptop, The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

Your Video Card (Graphics Card) is probably bad. To isolate the problem connect another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays the same NO Signal Message then your video card is bad. If the Borrowed monitor displays and works correctly, then your original monitor is bad. The fact that your monitor displays the No Signal Message on it shows that the monitor is ok.

If you have a laptop, the video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

Check the time if you can, doubt it since it can not display anything.
This usually happen when:
1. The memory card is bad, needs to be replace.
2. The video card is bad. Since it's a laptop, then the problem is with in the motherboard.
Sometimes when the BIOS battery is drained, it also stop the computer from displaying. To see the battery you must take apart the computer.
And the last thing in the list is the monitor it self. Maybe the monitor got damage some how and it won't display anything.
To troubleshoot, I recommend you start with the memory, and since the computer must be 64 bits, it needs 2 memory card of at least 2gb. each stick, if one of them is damage and both are still connected to the motherboard, the monitor won't display anything either.

Is the monitor showing a blank screen or is it showing the message NO SIGNAL??

If you have a Desktop try the steps below:
If it is showing the message NO SIGNAL, then the video card in the computer is bad, because when the monitor is bad, it will show nothing at all. To isolate the problem plug another monitor on the computer and see if it displays. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok, then your original Monitor is bad. If the Borrowed monitor displays the same as your original, then the video card in the computer is bad.

If it is a laptop try the steps below:

Sounds like your monitor is bad. Try another monitor because if the video card was bad and the monitor is working you would get a No Signal message on the screen. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok, then your original monitor is bad. If the Borrowed monitor does the same as your original monitor and does not display anything, then there is an issue with your video card.

Looks like you might have the video card problem again.
If the computer is working but there is no display, you have a bad video card or bad monitor in all likelihood.
Do you have another monitor to check it with? If so, do that.
If you have a video adapter built into the motherboard and an add-in video card, use the motherboard adapter to see if the computer is putting out a signal.

If you actually get video when the computer starts up and when Windows starts it goes blank, then you have a Windows driver problem. In that case, do a safe mode startup and do a system restore back to when it worked.

Does your desktop/PC display show anything before the monitor goes into power save mode? If nothing comes up, its possible that you have a loose VGA connection or that your video card/motherboard are defective in some ways. Try using a different monitor.

If the other monitor works fine with your computer, try changing/lowering the screen resolution. If in XP right-click on the desktop and go to Properties, and select the tab for display settings and adjust the resolution. If in Vista/Win7, right-click the desktop and select Screen Resolution/Display Settings and adjust it there. Then check and see if your LG monitor works on it.

If the other monitor also doesn't show any display, most likely the problem is either with your video cable or your PCs video card/motherboard, not the monitor.

Hope that helps. Good luck

I would first recommend reseting the bios, if the monitor still is black then it may be a problem with the graphics card

remove everything except for video card and memory cd hard drive etc give it a try
if it shows boot screen you have problems in something you disconnected retry one at a time
if not try different video card

The solution may be one of several things. here are my ideas in increasing severity.

1) Bad connection. Fix: tear apart the screen and check the video connection. It looks just like that when you don't have a good connection with the sync signals from the motherboard

2) Bad screen. Check video feed to external monitor. Shut down laptop. Plug in an external monitor. Start it up and the external monitor should show a good picture if the problem is a connection or a bad screen. If it's a bad screen, you will need to replace it (easy to do at home for 1/3 the cost of some outside source). Go to ifixit or instructables or repair4laptop to get ideas and walkthroughs. So, good feed to external monitor and no bad connections=bad screen... maybe.

3) bad video card. Replace motherboard = $$$. this is more difficult to do at home. If the external monitor shows the same streaky picture, you're pretty much guaranteed that you will have to replace the motherboard.

try pushing on various parts of the computer to see about bad connections, usually two thirds to three quarters of the way up the back of the screen is the connection and somewhere under the keyboard is the video card. don't press too hard, but see if anything's different when you try it. Good luck.