Samsung 940B monitor, 14 months old. Power light on when connected to PC, but no images, not even menu or Digital/Analogue prompt. PC recognizes the monitors presence,any ideas please?

a Desktop so old it still has floppy drive, (we trash these the PC)
PS2 keyboard and mouse.wow.

ok, you just found a very old 2003, 14 year old relic PC?
why think any old PC this old can work,, there well be lots of problems!and what monitor is there, name and model number
those same age all fail too, by now with dead CCFL lamps inside.
all do. did, long ago.

so the screen is black and never once shows text , RIGHT?
that is called the black screen of deathh(sic)
HP Pavilion 325c Desktop PC (US) (HP says its RETIRED)
end of the road, support (all)

power on the monitor
see it show, a monitor message log, or words, or even the OSD pops up
then turn on the PC next, see the Screen work show text
or shows nothing , black or the monitor will show.
NO SIGNAL
NO SYNC
OUT OF RANGE.
sleep mode or power saver mode.
The monitor if 2000 an newer will talk to you, it shows failures.
on screen.
does the PSU fan spin, if not the PSU is dead.
and more.
the VGA cables needs to be connected from Monitor to PC.
the power cables both good.
the Monitors menu button must work on front of monitor
or its sign on messages work, it must year 2000 to now.

Shine a flash light onto the monitor, if you can see icons/desktopon the screen then you know you need a new monitor!
You should be covered under warranty!

Have you tried connecting the monitor then powering the PC on. at that point i would say it could be a problem with the PC.

When you connect the monitor and power on the PC, do you see anything on the monitor screen at all?

Has anything been modified on the PC right before it stopped?

Here are the service manual: http://elektrotanya.com/?q=showresult&megnev=Samsung%20&megnev2=940B%20&kategoria=&kat2=all

You may be better off getting a small inverter that convert 12vdc to 120vac @ 100watts or more.

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

press menu button increase brightness if no picture then there is a problem in monitor open it there is a fault in e.h.t. take screwdriver and rotate a preset attatched to e.h.t.which is a biggest black part of a monitor if no brightness on monitor then replace E.H.T

Was the PC running, and then shut down? Or, did it never start in the first place?
It sounds like it could be one of many things. Sometimes if the processor fan has failed, the computer will start up, and then shut down. Also, bad memory can cause the PC to shut down.

try the monitor on a friends computer or family menbers computer first as it may be your grafic card at fault.

Sounds like you have a video card problem. If it works on someone elses PC and not yours. Replacing this video card on your PC should fix it..

Are you sure the TV has a built in tuner? Does your country have digital over air broadcasting like my country or not?

Hello.
Sounds like the backlight inverters or CCFL tubes are at fault.
Turn the monitor on with it connected to a known good SVGA signal source that is sure to have video. (Like the computer when it is operating.)
Hold a flashlight to the screen of the monitor and see if the faint video can be seen through the screen.
If the video is faintly present on the monitor screen using this method of illumination, then either the CCFL inverters / Inverter board has failed, or the CCFL tubes themselves have gone bad. (CCFL = Cold Cathode Fluorescent Lamp)
This should give you a better idea of how to proceed, repair or replace.
If it is the inverters or CCFL, Repair costs for a DYI project could range from $70 to $120 depending on the level of your expertise and parts availability.
Good luck with your quest.