No input signal go to power save - Sony SDM-HS75/B 17" LCD Monitor

I do not know how many Thinkvision models are out there, but here is a site that offers manuals you can read online or download.
This is just a page from the manual I found. Here is a link to the manual I found. http://www.manualslib.com/manual/91948/Lenovo-Thinkvision-E54.html#manual
THIS MONITOR WILL APPEAR TO BE NON-FUNCTIONAL IF
THERE IS NO VIDEO INPUT SIGNAL. IN ORDER FOR THIS
MONITOR TO OPERATE PROPERLY, THERE MUST BE A VIDEO
INPUT SIGNAL.
This feature is designed to conserve electrical energy by reducing power
consumption when there is no video input signal present.when there is no
video input signal present.When there is no video input signal, this monitor,
following a time-out period,will automatically switch to an OFF mode. And the
LED will turn orange. This reduces the monitor's internal power supply
consumption. After the video input signal is restored, full power is restored
and the display is automatically redrawn. The appearance is similar to a
"Screen Saver" feature except the display is completely off. The display is
restored by pressing a key on the keyboard, or clicking the mouse. Lenovo ThinkVision E54 User Manual

Hello, I didn't understand the problem.
1.After switch on and it goes to power saving mode , which can be visibly seen by changing the color of power led from green9or blue) to yellow.

First thing to be done is when it goes to that state "power saving mode" remove the video VGA cabl , and if the unit gives video message "no video signal" which stays for a while and usually goes again to power saving mode , this is OK,
So if there is no video signal on input it should work like this. so you have to check you PC.
Another way is to use laptop or other PC to check the monitor itself.

Hope this helps a bit

power save mode indicates no input signal. Check the input signal with a known good monitor. if the signal is good then dell monitor is faulty. Power cycle (unplug the power then plug it back in) the monitor to reset to factory and if it still goes directly into power save mode the unit is faulty.

I f you see the message on the screen indicating 'NO INPUR SIGNAL', you need to check the VGA cable and both ends of the connectors also. Try this monitor with other PC also.

This SDM-HS73/93 have common problem: bad backlight assemblies due to poor workmanship in sodlering works, see my pictures below. You should also inspect the caps. This is not recommend for DIY.

http://s807.photobucket.com/albums/yy352/budm/Sony%20SDM-HS93/

http://s807.photobucket.com/albums/yy352/budm/Sony%20SDM-HS73/

http://s807.photobucket.com/albums/yy352/budm/Sony%20SDM-HS73/

The reason why your secondary monitor is showing no input from computer is because of the display resolution of your graphics card, which is higher than what the Monitor can handle.
What you can try is, when your system is powered up, just go to your display settings, then reduce the systems display resolution to--preferably 800x600, then go to where you normally select the output, and select 'Output to external monitor"...this should send the signal input to the monitor.
I have actually dealt with a no input signal before, and this was what I did.
Hope this helps.
Goodluck!

Yes, a bad video card could prevent the computer from starting at all. Your monitor is going into power save mode because the computer isn't sending a video signal. This could be due to many things, power supply, memory, video card, processor. Try blowing all the dust from it and reseating all the components.

This is most likely because the TV is going into "Power Save" mode. It is not detecting any signal on the input it is set for. When you first power it on, make sure there is a signal to the input that you have selected. This normally takes about 30 seconds, but if the TV is set for the VGA input it can happen quite quickly.

Turn the television on and as soon as the screen turns on repeatily press the input button or change the input to whatever input you are using from a source device. As long as you change it to anything other than RGB.

Your television is essentially a big computer monitor with multiple inputs and a tuner. When using your computer and shutting it down the monitor will go in a power save mode. You don't need to shut off your monitor due to this power saving mode. When you power up your computer your monitor automatically turn on.

With the VIZIO and the RGB (computer) input the television will act just like a computer monitor. When you have a computer connected it will power down automatically when you shut off your computer. When you turn your computer on the VIZIO will automatically come out of standby mode. This is through RGB only.

This is normal operation for the VIZIO but can see confusing when nothing is connected to the RGB input. If you change your television input to RGB it will sense no signal on the input and will go into standby mode after about 5 - 10 seconds. If you were to send a signal to the television through RGB it would automatically kick on.

To isolate the problem, you need a friend with another computer since right now, we don't really know if the video section (or card) of the PC is at fault or the monitor.
You need to swap displays with someone so you can be certain what is actually not working.
The monitor is obviously capable of scanning inputs for a signal and not finding one.  

Its impossible to say without knowing more than that. If the TV does not detect any signal on whichever input (other than CATV) your on, it will power down. Make sure you are getting an input signal and make sure you are on the right input on the screen.

More info on your problem and i could probably help you better!