LG flatron L1918S Out of Range 68,5kHz/85Hz

Hi, that message indicates that your video source is providing an unsupported video resolution , please check in settings that video output resolution is no more than 1920 x 1080 @ 60Hz.
Also remember to verify that HDMI is selected as input source at monitor.

Try connecting your monitor to a different computer.
If it still turns on and off, the monitor is failing.
It needs to be replaced.

This is usually due to your computer Video resolution being set to a setting out of the supported range of your monitor, Lowering the computer video resolution should solve this issue.

It is about unsupported mode of your monitor, try to locate all allowed modes in display setting.
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At 85 hz refresh rate can damage you monitor, most LCD monitor are not recommended to go higher than 75Hz. You should set you PC video resolution to the native resolution of the monitor:
1280 x 1024 @60Hz.

http://www.fixya.com/support/r4873371-fixing_out_range_format_not_supported

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

this is a how to video on how to fix the video out of range error.

1280x1024 resolution
I would try using a 60hz refresh rate though it does state the monitor will support up to 85hz

You should google this. After looking myself i have seen that it should play HD movies without a problem.

It means your PC video resolution is too high for the monitor to display, you need to set your PC video to the native resolution of this monitor, 1280 x 1024 @60Hz.
Start up in sfae mode (hit f8 while booting up), select VGA support, then right click on desk top/properties to bring up display property/setting. set the new resolution , reboot.

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

It means your PC video output resolution is too high for the LG monitor to display (your old monitor (CRT) can handle higher resolution than this LG LCD monitor), you need to set the PC video resolution to native resolutionof this monitor which is 1280 x 1024 @60Hz. You may have to use the old monitor (CRT) to set the resolution to 1280 x 1024@60Hz, then hook up the LCD monitor.