I am using a U2412M display and it has begun having a variety of issues since yesterday.
The only way I can fix it is to pull the plug. When I plug it in again, I get the boot screen (Dell logo) and then it works normally for a few minutes. New cables, a different DVI port and/or plugging into another video input on the computer has done nothing. I am running a DVI splitter off the video card so it has a 2nd monitor attached, and it is unaffected. This computer also uses a SEE2 Xtreme external video card for a 3rd monitor, but it also seems unaffected and unplugging it does not help the problem.
I have also checked the diagnostics trick (hold down capacitive buttons 1 and 4) and I can't get it to come up. Probably because the buttons do nothing.
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I just tried bringing up the diagnostics immediately after reboot and it did come up. The first time the buttons failed after just a few seconds and I was stuck on the gray screen. The second time, I went faster and made it through all the screens. They looked normal.
I also forgot to mention that the monitor is also prone to simply "turn off" and show a black screen. The screen still glows--you can see a difference when it's unplugged--but it looks black.
Now I am starting to see failures during reboot. The Dell logo appears and the capacitive buttons light up, but then colored pixels appear on top of the logo, bounded by a box around the logo. All I can do is unplug it again.
* Only the 27" and 30" monitors have a Service Tag number
* If you only have a Dell order number for your monitor, you should contact Order Support for your country
* If you purchased the monitor bundled with a Dell computer, contact Technical Support for your country and use the computer Service Tag number
* They will need the following data -
Monitor Order number or computer Service Tag number if bundled:
Monitor 20 digit PPID number:
Contact the procurement team in your corporate environment so they can get us the Dell Order number. Then, we can check the warranty status against that number.