DARK RECORDING!!!!! my camera is recording footage but everything is extremely dark. Except for the things that are very bright (light bulbs, computer screen) i need help so bad please respond!!! PLEASE!!!!

It could one of a few problems:

1. The viewfinder is pulled out and "PRIORITY" is set to "FINDER".

Push the viewfinder back in or set "PRIORITY" to "LCD".

2. The LCD monitor's brightness setting is too dark.

Adjust the brightness of the LCD monitor.

3. If the monitor is tilted upward 180 degrees, open the monitor fully.

Download the manual for more info:
JVC GR D290 Manual

The whole point of a webcam is to be able to see the person you are speaking with, and let them see you. When the image broadcasted by your camera is too dark, the person on the viewing end won't see anything but shadows and dark shapes. Learn how to brighten your webcam image so the people you chat with can see you.

Place lamps behind and to the side of the webcam. This casts a light on your face, but the lamps will not wash out the image because they are behind the camera. Turn off lamps that are behind you. You have trouble seeing things when you are looking in the direction of the sun or a light bulb. Your webcam has the same problems. Don't make it stare at a bright light. Open up a white screen on your computer to brighten your face. The white screen will create the brightest possible light from you computer screen and help lighten your webcam image. This option is best when lamps are not available. Open up an empty tab in your Internet browser, or a blank Notepad document, and expand it to the full of your screen. Adjust your webcam settings. The settings available to you will depend on your webcam, but many of them offer a "Brightness" setting that you can increase to lighten your webcam. Open the program that came with your webcam, then look for a "Settings" or "Options" menu. Increase the "Brightness" setting until it has lightened your webcam enough.
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That filming in dark or light would not make a camera go wrong, worse thing he could have done with it is put the lens towards a very bright tungsten light messing about ( if he has ) the Iris would burn out, if this has happened you are looking at a few bob to repair.

The most likely thing is that your screens backlight or inverter has gone faulty.
When you turn it on, you may be able to see a very very dark image of something (best seen by activating the TV menu). On some screens the picture is still far too dark to be visible though.
With this kind of fault, its down to fitting a new inverter, and if that doesn't cure it, then fitting a new backlight bulb (or bulbs) will sort it out, but these are not jobs that can be done without some expertise at them.
Most TV inverters are large circuit boards inside, and take about 20-30 minutes to change as the whole TV has to be dismantled, but the backlight bulbs are much more complicated (and extremely fragile too).
Unfortunately, there's not much else that can be done except trying changing those 2 parts. Although its possible for the screen cable inside to become disconnected and lose your picture, that results in the screen lighting up brightly (usually pure white if the cable comes off completely).

Go to the Control panel.Select the Web cam and go to its settings. Adjust the brightness,saturation, etc and see the difference

"stage lights" may still not be enough- there should be alow light indicator in the viewfinder (amoung the many things being displayed)- Also, the camera manual should tell you the minimum illumination that the camera will record in (usually listed as LUX or Footcandles, or sometimes in EV), but unfortunately you would want an old fashion light meter to check the light level of the stage ahead of time

Video head was dirty / clogged due to old tapes usage so it did not recorded any signal on tape and now it requires cleaning with good quality head cleaning tape to record and playback properly.

I have a sony cybershot DSC-S650, the LCD was very dark and could not see anything except if I pointed it at a bright object, everything else worked ok. I could take pictures but could barely see them in playback as well.

I took it to Sony authorised repair outlet and was told the CCD was damaged, they charged me USD $55 to repair it (in Quito, Ecuador)

Your manual if available here.

if it is only recording bright light sources then it must be working fine outdoors in broad day light. if so, it means the auto iris of your camera has stucked to minimum opening. was the camera lying idle for long time. try pointing the camera towards low light and bright light with quick moves.some times by doing so it gives a little jerk to the mechanism and it starts working, or lightly patting the camera on the lense side may solve the problem. otherwise let the repaires earn some money.