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Can you give any more details? Does anything else come on screen before that message?
Try this site which deals with the problem.
When you turn off the pc the monitor loses the sync signal and should go into a suspend mode where the screen is blanked. The power management settings should be checked. In display properties check that the monitor is installed correctly.
Try this per HP:
HP Business Monitors - What Do I Need to Do When the Message Sync out of Range Displays on the Monitor?
What do I need to do when the message Sync out of Range displays on the monitor?
When the video card signal exceeds the frequency allowed for the monitor, the following error message may occur:
Sync out of RangeSOLUTION:
To avoid the message, lower the resolution or vertical frequency of the video card.
Reboot the system and use the VGA mode to force the video card driver to lower its resolution. Follow these steps.
Shut down and restart the system.
For consumer systems such as HP Pavilion desktop PCs, push the Power button once.
For commercial systems such as HP business desktop PCs, hold down the Power button for five seconds.
Immediately after seeing the HP/Compaq logo screen, press F8 at system startup to initiate the bootup menu.
Scroll down to highlight Enable VGA Mode , and press ENTER .
After Microsoft Windows completes its bootup process, access the Display Properties and select a desired resolution, which is compatible to the connected monitor.
1. Loose VGA cable
2. Wrong driver installed or configuration made is out of monitor range
For loose cable you can fix it up from both ends, on CPU and on Monitor itself.
For second reason, we just have to delete display driver from Device Manager. Follow below method to delete driver
Start computer in safe mode. To start in safe mode, as soon the system boots up press F8 and select Safe Mode. After you log into the safe mode. Right click the "My Computer" icon on desktop, go to properties,
go to "Hardware" tab, Click on "Device Manager", go to "Display driver" and expland it, select the driver below the expanded "Display Driver" and press delete to remove the driver. Now restart the system and it will automatically adjust the display driver for you.
OSD Warning Messages
A warning message may appear on the screen indicating
that the monitor is out of sync range. Cannot
Display This Video Mode
This means that the monitor cannot synchronize
with the signal that it is receiving from the computer. Either the signal is
too high or too low for the monitor to use. See Specifications
for the Horizontal and Vertical frequency ranges addressable by this monitor.
Recommended mode is 1024x768 @ 60Hz.
Occasionally, no warning message appears, but the
screen is blank. This could also indicate that the monitor is not synchronizing
with the computer or the monitor is in a power save mode.
Hello, You need to get the monitor back into a range it can use and the best way is to go into SAFE mode on the pc put it back into 640X 480 and at 60 hz refresh rate. 37.9khz is way too high for the monitor! It is best in the 60hz to 80 hz (if it can go that high!) start at 60 to begin with and it will work. Good Luck! Rich Lilja
This may be the problem with the WYSE driver. Ensure that correct driver is intalled and colour profile is compitable. Syncmaster is auto detected by window based OS.the message "Sync out of range" comes due to improper out put video signal.