When I power up, the monitor will not do so willingly. If I press the off/on button off while the blue lite is on and then press it on and select the MENU button it will come on and look good after any whre from first attempt to 5 trys before it comes on. It will come on and say on until the machine powers done on the power save option. Sometimes it will come back. But if I shut the machine down when I come in the next morning it will not come on with out going through the series of steps with the Off/On Button and the Menu button. Once the big EMACHINES logo comes on, it will run ok for hours. sluggo123
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Re: monitor does not always come on
Sounds like the power board is starting to lose it's dc voltage power and making it hard to start till the board warms.
This will get worse and eventually it will die totally.
You probably need to rehab the power and inverter board
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Disconnect it from computer and power. wait 15 minutes and plug only the power back in, press the power on button. The monitor may display a message that there is no signal or something like that. If that happens the problem is either the cable or the computer. If you get no message then look for the menu button and press it to see if any thing appears. If not find the manual on line and read it. Many times monitors get over-driven by computers to the point that they can't display OR they self destruct.
Another way is to just unplug everything computer and monitor for 15 minutes. Plug in monitor first then plug in computer and press the power button, the display should display the booting information if the cable is good and the monitor is good.
It sounds like the lamp for your monitor is no longer receiving power. While you can attempt to fix this issue yourself I wouldn't recommend doing so as it doesn't mean it will work after you attempt it. If the monitor is under warranty still then you should contact the manufacturer about a RMA. If the monitor isn't under warranty then you should purchase a new monitor.
OSD and Power Lock Settings • OSD Lock: Press and hold  and the up arrow for 10 seconds. If any buttons are pressed the message OSD Locked will display for 5 seconds. • OSD Unlock: Press and hold  and the up arrow again for 10 seconds. • Power Button Lock: Press and hold  and the down arrow for 10 seconds. If the power button is pressed the message Power Button Locked will display for 5 seconds. With or without this setting, after a power failure, your LCD display’s power will automatically turn ON when power is restored. • Power Button Unlock: Press and hold  and the down arrow again for 10 seconds.
I had the same problem and I went to the first button on the monitor to the left(main menu) then with the button to the right (-) I scrolled down to factory reset. I also did the osd setting and I'm not sure what fixed it, but I havn't had the problem sence.
I have such iiyama AS4636D monitor. In this day purchase. I have such problem with you. My solution: Desktop pc and lcd power off (230VAC or 110VAC) Power on lcd, after early desktop pc. This moment, when running the pc booting, press and hold you the " + " button. In this moment come in one blue screen. May be running on the sreen short message: check or select input mode: VGA DVI 1 2 . Select your correct cable connection type.
I didn't have the monitor connected to the computer, and that's why the power button was unresponsive. After connecting it, the solution above worked for me.(My KVM switch was set to a computer that was turned off)
i fixed this problem by unplugging the monitor, unplugging the video cables. Then hold down the power button while plugging it back in. Release power button and then press power button for on. It worked then. I got the icon for no signal, i plugged back in my monitors. Sceptre X9W
Follow these steps to solve the problem...
Make sure that the moniter power button is off.
Unplug monitor from mains ( the auto exit button should flash red after about five seconds and you hear a popping sound.)
plug monitor back in mains.
hold down + and - on the monitor
now hold down power button on monitor
let go of power when power button when the green led lights up
let go of + and - buttons
wait a few seconds and press menu, a hidden menu will appear in the top right
use the + and - buttons to move the highlighted option over the auto colour option in the menu
push the menu button.