Question about Dell UltraSharp 2407WFP 24" LCD Monitor

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Dell 2407WFP Monitor losing signal and having colored line artifacts

I have a Dell UltraSharp 2407WFPb 24 inch LCD monitor Rev A03. I run it via DVI-D at full resolution (1920x1200) in portrait mode, that is, turning the monitor on its side with 1920 pixels vertically and 1200 horizontally. I am using Windows XP, and this monitor is my second, that is, the Windows desktop is extended onto this monitor.

I have two problems, probably unrelated.

(1) My Windows settings have the monitor powering down after 10 minutes of not being used. When it goes off and I move the mouse or something to power it back on, it sometimes doesn't seem to find the signal and says "Out of range signal. Cannot display the video mode, change computer to 1920x1200@60Hz".

If I then step through the various input modes (S-Video, Composite, Component, VGA, and then DVI-D), sometimes it comes back on, and sometime not. If it doesn't come back on, I go to "Display Properties" in Windows, turn off "Extend my Windows desktop onto this screen", and then I turn it on again. So far, this procedure has always worked, and the monitor finds the signal again.

2. There are often one or more thin colored lines shooting across the screen. They would normally be horizontal (from left to right), but because I have the monitor turned on its side, they come out vertical. They start somewhere in the middle of the screen and extend across the rest of the screen. The problematic lines seem to be a function of what is being displayed. My video card is an NVIDIA GeForce 7600 GT, and the other Dell 2407WFPb Rev A00 monitor I am running never has this problem.

Many thanks.

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also suggest trying a newer monitor if possible. most of the time it is just setting refresh rate alittle lower. good luck.

Posted on Nov 17, 2014

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Dell 2407WFP Monitor losing signal and having colored line artifacts this trouble maybe power supply or inverter boards is defective.
first you can test the voltage of the multr,and then check which part is defective.From can find those parts
if you have any question,please let us know,we sincerely hope we can help you!
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4H L2K02 A01 Dell 5E L2K02 001 Power Supply for 2407WFPB

Posted on Nov 13, 2014

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To your problem number 1:

I would check to see what the refresh rate is on your main monitor. Especially after waking the monitor from sleep, Windows tend to forget the refresh rate settings on secondary monitor and set it to the same as your main monitor. If your main monitor is set at 75hz or something, it could cause the secondary monitor to display the "out of range" message. When you reset the "extend my desktop to this monitor" setting, it probably resets the refresh rate to 60hz again.

This can sometime be remedied by checking to see if the monitor drivers are installed correctly. A lot of times the video card driver also gets in the way. I've had a lot of experiences with ATI drivers behaving very sporadically with multi-monitor setups, where they will consistently change to "plug-n-play monitor" and thus reverting any custom setting I have.

As to your problem #2:

I've had a fair bit of experience with this as well. The fact that the line shows the same way regardless of the monitor's own tilting orientation, means the error is probably coming from the video card signal rather than the LCD panel itself. This usually is a foresight of a nVidia card that's about to break.

I've went through many, many nVidia video cards over the years. They all inevitably break over time, probably because nVidia relies strictly on third party vendors... and to stay price competitive the third party vendors cut corners wherever they can. I always get the same horizontal line error over time as you described here.

The only way to know for sure, is to get a replacement video card, borrow one from a friend if you can, and see if the same problem still comes up. It's very possible for this to show up on only one of your two monitors. Try switching the monitor output as well, to see if the line now shows up on the other monitor instead.

Posted on Nov 04, 2008

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Posted on Jan 02, 2017

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