You might have to change the screen resolution on your "other" computer because it might no be a valid resolution for your monitor. Although you should see the screens when it boots up. You may also want to check if your monitor has an input button and select a different input. Do other monitors work on your "other" computer?
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Your monitor may have an option to set it as "manual" or "auto". If set in manual, you will have to turn off the monitor power switch each time. If it has the "auto" setting , it should shut off or "go to sleep" when it detects no input signal.
Both monitors must be plugged in when the computer is started for the second monitor to be detected, and you must configure the second monitor once the computer has started
In windows XP: control panel -> display -> settings tab -> select second display -> check "extend my windows desktop onto this monitor" -> click apply
In windows vista/7: control panel -> adjust screen resolution -> select second display and then under "multiple displays" select "Extend desktop to this display"
It seems it is a motherboard battery problem. It most likely is not the monitor which is in "sleep mode", it is the computer itself.
When you cannot get a computer out of "sleep mode" by any other means, typically the cause is that the button-cell-type battery of your computer, which is located on the motherboard, is empty. When your computer detects this battery is empty, it goes into a low-power mode. The solution is to replace the button-cell battery on the motherboard of your computer
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If you would start the Dell in safe mode, you should be able to adjust the display settings to values that will work with the monitor. Or remove the monitor in the device manager and let windoze detect and configure the monitor on the next boot.
I ended up fixing my problem, but I'm not sure what the solution is. I had some faulty electrical equipment that I was using to power the monitor (220V to 110V converter and a bad power strip) and I got rid of them. I was using the converter because I moved to Israel and I thought I needed to feed the monitor only 110V, but I now realize that the power cord for the monitor has a built-in converter that accepts 220V input. Now the monitor is plugged directly into the wall and is working fine. Try using a different power source (maybe the wiring or plug you're using is faulty). Good Luck!
Try looking at the Monitors Plug, Look directly into the Plug, you should see 15 small pins inside the plug.
Sometimes one or two of these pins get bent over and no longer makes contact. If you do see a pin than is not pointing straight out like the reset, the best thing to do is to use a small pair of needle nose pliers to gently straighten the pin. Be very careful becouse once a pin is bent it can break easily.
It's sort of a solution, but I work in a computer shop and got this screen in yesterday. I looked at it closely and it's actually the backlight that died. I pulled it apart and found that three of the 820uF/20V capacitors had swollen up. If you replace them then you should be fine, but I went for a different approach and took the inverter board from a laptop and put the in the screen and used an external power supply. It's a bit dark but it works fine now.