There is a red on and off icon on the sceen

Try unpluging the tv for several minutes and then plug it back in and turn it on and see if that helps

Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

disconnect the units from their power source and wait about an hour. Reconnect to power source and see if this has reset the units.

Hope this helped you good luck on the repairs

Dave

click here you would find the details for led codes. you may select any laptop. codes remain the same.

if its the red flashing light on the tower, its the hard drive activity light.

when the monitor goes on stand by, does the tower retain power? (green light on and flashing red light sometimes?) Does your keyboard's scroll lock/num lock/caps lock keys and keyboard lights work?

First you'll have to power off the system.
Please power on the system and as soon as you see the Dell logo please tap the F2 button 3 - 4 times.
The computer will go to the system setup. Check if the screen goes blank here.
If the screen stays on then try this.
1. Please power off the system.
2. Please power on the system and as soon as you see the Dell logo please tap the F8 button 3 - 4 times. You'll reach the Windows Advanced Boot Options Menu on the screen.
3.Select Safe mode with Networking.
4. Select Administrator at the log in screen.
5. Warning dialog box with the message Windows is running in safe mode. appears. Click the Yes button.
6. The desktop appears with the words Safe Mode appearing in all four corners.
7. Uninstall the video drivers and restart the computer.
8. Resintall the video drivers.

Rate if useful.

This is a serious problem, you have to call SS right away since it is in warrantee. They need to check whether the panel is defective.

The problem is not with your screen. Its the problem of Video Card of your system which is unable to send Video Signals to the Screen.

if it goes off even with no sound, system is put on stndby protection mode. something wrong with your output section. busted power output xtors of IC.

In the auto review section (under the setup menu) change from 5 seconds to 1 second.