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Was your monitor previously working? Is your monitor set to receive input from the cable its connected to? There are different inputs for monitors usually. Make sure your monitor is set to receive input from the cable (vga, hdmi, DVI, ect.). If your monitor is very old, it may just be that's it's giving out. If your monitor is new, it may be that it wasn't working to begin with. If its not the connectors, then the monitor may just not be working.
You can run that monitor from a DVI connection but you would need to get an adapter from DVI to ADC and that supplies power to the monitor. DrBott makes an adapter like this called the DVIator (http://www.dviator.com/) that should work for you if you other CPU has DVI out.
Make sure that the correct cable is used vga to vga or dvi to dvi..... try some different cable.... try a monitor slf test you cannot access it by just removing the monitor cable..... if do get the test the monitor is bad
FIX for design fault of ASUS VW222u Problems with monitor using dvi while vga works fine. my ASUS VW222u had the same problem many are reporting after about 8 months with developing colored "noise" onscreen or dancing red pixels while using dvi but vga is fine.
my old man is an electronics engineer, rather than be without a monitor
since vga still works fine we decided to have a look.
we worked out the problem. note: this is a fix for the random picture noise problem while using dvi port.
If monitor works ok with vga but dvi has noise then this fix should work for you.
1.open monitor (will void warrenty) 2.unplug
all the the cables going to the power supply and dvi port assembly,
undo two screws pull down and out you wil now be looking behind the dvi
port and be holding a metal module that contails power supply and dvi-
and vga port.
3.you will notice a piece of brass foil joining
the earths on your dvi and vga cable this is the problem creating an
"earth loop" as both vga and dvi ports are earthed to the metal casing
this extra earth is causing the problem introducing noise.
unwrap the brass foil from the two cables and seperate, insualte cables
with electrical tape. (wrap around each one seperately they should now
be indiivdual cables)
4.you will notice a silver spring type peice of metal on the assembly that pushes against the main
body of the unit when re-assembled. scratch the metal with a
screwdriver where this peice pushes so you get a good connection when
you reassemble it, do not touch as finger grease could screw up the
connection. (this step is not vital just a good thing to do why your in
there to make sure the the unit is properly earthed)
fixed mine and was quite easy, take care with the plastic latches they
are tight - ensure you remove all 5 screws, to see the fifth easily the
monitor stand must be removed (two screws then stand slides out from
rear of case)