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In a word: Nope.
I know this thread is old but I have one of these monitors and it just started this mess.
Chris' solution does not work - at least not for me. The monitor is connected to an Oppo DV-980H and had no issues at all until today, when it suddenly decided to throw this error message out of the blue.
The user manual available online is an abysmal scan of a decent manual (that doesn't cover this problem BTW) as it is a poor scan. The text is unclear and in many places cut off on the right margin, so entire words are missing. Honestly, I expected better than that from Dell.
Anyway, the only thing that I've found that works is,.. NOTHING! The monitor has apparently decided to become a <profanity>,
I will continue to attempt what OP stated above - unplug EVERYTHING and leave for 20 minutes or longer, replug & power and hope for the best.
Good luck if you're also having this issue. If you find a way that does work, please post it here. If you can't get it to work, time to look for a new/different NON-Dell monitor. :-(
This <profanity>. Sorry to be so negative but as I said, my monitor has been working without issue with all but the VGA connectors attached to something and now out of nowhere I get this unresolvable problem. Very frustrating and disappointing. I have gear attached that I MUST see menus for in order to operate.
9 years is a good run for any monitor. Most users would be glad to get that many years out of it. Generally, by unplugging the power cord and pressing the power button in for 10 seconds will "reset" the monitor. The 2407WFP manual text is clear and the right margin is not cut off for me using Google Chrome.