Hello Pman019,

Your monitor provides a self-test feature that allows you to check if your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps:

• Turn off both your computer and the monitor.
• Unplug the video cable from the back of the computer.
• To ensure proper Self-Test operation, remove Analog (blue connector) cable from the back of computer. 
• Turn on the monitor.
  
  The floating 'Dell - self-test Feature Check' dialog box should appear on-screen (against a black background) if the monitor cannot sense a video signal and is working correctly. While in self-test mode, the power LED remains green and the self-test pattern will scroll through the screen continually.
  
  
  
• This box also appears during normal system operation if the video cable becomes disconnected or damaged.
• Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.
  
  

If your monitor screen remains blank after you use the previous procedure, check your video controller and computer system; your monitor is functioning properly.

Hope this helps! 

I did as you said,yet the screen is still black! I don't see anything on it, even after I did as you said(when I tried to put it into self check mode). I meant it was still black when I tried to put it into self check mode. I don't see anything on it, other than the green power LED. I looked really close and I can see a small white rectangle that says "White" inside of it in black. This box continues to bounce around the screen. I also looked again and found the self check feature test. Remember that these are very faint and I can barely see them.

Then the monitor is defective. We do not repair monitors, we exchange them while under warranty.