If there is one annoying issue with this AMAZING monitor, its the energy saving function that sometimes kicks in and doesn't seem to wake up on pressing the U2410's power button, keys or mouse. My monitor doesn't have a power saving plan in Vista power management or anything else in BIOS.
Anyone have any ideas on this?
There are Display Port power management issues. A02 supposedly contained fixes for many of them, but (if you're using A02 and it's still giving you issues) I'd recommend you use the DVI input.
Otherwise it's just Vista in combination with your graphics card drivers and whatever. The screen never fails to wake up for me on Windows 7 via DVI, but Windows itself is really bad at resuming properly from sleep mode. Whilst it (mostly) works, I've had it hang quite a few times, requiring a hard reboot. Even OSX, where Apple are dealing with known hardware, has similar reliability issues from sleep / resume on some of its hardware.
Edit: BTW.. to confirm A02, it should show as M1F193 in the top right of the Innolux Factory Menu in the U2410's factory test mode.
Accessing the Factory Menu:
Power off the screen. Now hold the Brightness/Menu buttons quite firm. Now power on, and the buttons will light up like normal. When the lights reach the top (the Presets Mode button) you're still holding down all this time.. you don't let go of brightness/menu. The Presets Mode light will then turn off and back on again. When that happens all the button lights now stay lit - When it does that you're in test mode. You use the presets button to bring up the Factory Menu on the left side of the screen.
As to the comments from some others above, whilst I think the U2410 is mostly great when you get one with good colour gradation (still the major caveat about this screen, and all IPS panels without corrective uniformity controls for that matter), I certainly wouldn't be paying the sorts of prices some are asking right now. No reason these monitors should cost beyond £400 when even Dell USA is selling them for the equivalent of £320 on offer right now. If you can't get a decent price then I'd definitely look at the HP ZR24W instead. The U2410 might be a bit better, but it's not £200 better IMO.
Some people are reporting an A04 firmware on panels shipped in December. Haven't seen reports on what it changes yet. For people running an earlier firmware, or worried about buying a screen with an older firmware, it is extremely simple to update your U2410 to A02, at least for those comfortable with things like flashing their motherboard BIOS etc, so the firmware version you get doesn't matter much. What matters more is your original box packaging has a Works Number so you can take advantage of any remaining warranty through Dell.
Hopefully someone at Dell will be kind enough to make any A04 firmware available to end users too, as they have been with both the A01 and A02 upgrades.