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1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or flashing, but nothing displays, borrow a monitor from a friend. If that works, your monitor needs replaced.
Monitor STFC (Self Test Feature Check) * Turn off the monitor * Plug the monitor power cord directly into the wall socket to remove any surge protectors or APCs from the troubleshooting equation * Unplug the monitor video cable from the back of the computer * Turn on the monitor * The floating dialog box should appear on screen against a black background. If the issue appears during the STFC, the monitor is defective. Get it replaced.
Check out the monitor power sources first like loosed A/C cords plugs in,dead plugs in outlets.Tried reset the monitor back to factory setting by unplug replug back in like an hour later.Non of these solutions works,than your monitor power supply board is dead that the board where the A/c plug into.Try website like EBay.com to buy a new refurbish power supply board for the replacement.
If your monitor uses a power supply (the brick that plugs into the wall, and then a smaller cord plugs into the monitor), then it's more likely the power supply that's gone out than the monitor itself.
Find someone with a multimeter to check the output voltage on the power supply. There will be a label on the power supply that says what the DC voltage (VDC) is supposed to be. If the meter shows no voltage when the power supply is plugged into the wall, then you just need a new power supply.
Do not try using another power supply as a substitute unless it is a specific match to your monitor. They vary widely by output voltage, etc. and using the wrong one could fry your monitor.
Believe it or not but theirs an order in witch you should connect up a compute,r but first make sure that there is only 1 VGA port ie (monitor socket) on the back of it. But if theirs 2 then try the other one. Other than that try this: Unplug EVERYTHING! even the power leads from the back of the monitor & pc. 1.Press the power button on pc & monitor to flash out any power left in them. 2.plug in & tighten the VGA cable to the pc then to the monitor if required. 3.plug in all other peripherals ie USB / MOUSE / KEYBOARD etc... 4.plug in the power supply to the monitor then the pc. 4.Switch on the power supply to the monitor first then the pc. 5.Switch on the monitor by it's power button then the pc right after it.
Two cables are needed, Power and Data signal (VGA). Most monitors take the same type of power cord as computer power supplies. (Some computers will allow you to plug in a slightly modified cable that will power the monitor off the computer's power supply. This cord has similar ends on both sides (with the prongs inside a rubber housing). The only issue with this is it makes the power supply work harder and thus can fail sooner.) Most computer supply shops (online and brick-and-mortar) will have the power cables, if you don't have extra cables hanging around.
Yes that is the first thing to check. Make sure the power cord is plugged into a good outlet and plugged into the monitor. If it still does nothing use a volt meter and check to make sure th power cable is good. If the cable is good you may have a bad switch. If that is the case unless you are familar for electronics take the monitor to a repair shop and don't try to take the monitor apart to start checking switches.
Well now if you go asking shop folk for this -they wont use their imagination, just in case they get it wrong and you sue.
Just be sure that the voltage you need is - what it is - 12V did you say
Then go the the electrical isles small items and you will see usually in a bubble pack on the rack a power supply- with a strip of various connectors.
The power supply will have a slider switch to select vorltages from 1.5-3-4.5-6-7.5-9-12 volts.
These will also have a coloured patch.
The connectors are also coloured on the tip.
Pick the connector colour that matched the voltage colour- plug in into the cord and lug it into the monitor .
And it does not work Huh!
Then unplug the connector from the cord and turn it around plug it in- then it it will work.