So I've had this 2408WFP for about five and a half months, been using an HDMI cable and everything has been great. However as of today I've come back to find the monitor "stuck" in power save mode. I thought the computer (XPS 630) had gone into some type of standby mode, but things like the cd tray responded and I recalled I had disabled any type of sleep mode previously.
I did a hardboot and figured maybe it was a one time thing. Even disabled the screen saver. I came back a moment ago tonight to find it was "stuck" again. I still had the DVI cable so I plugged that in and my desktop came back. I'm not sure what's causing this to happen, but aside from noticing a blue light (might have been there before, I hadn't really noticed until there was no light from the monitor and my room was dark) coming from the back where the video card(nVidia GeForce 9800GX2 1024MB GDDR3) is, I can't think of anything different or any type of damage to the HDMI cable that could have happened (it's not in a very accessible spot, and I'd probably notice some damage).
In fact I just tried switching to HDMI via the monitor's buttons, and the screen went blank. I had to turn it off and back on to be able to switch to DVI again.
Trying to go back to either setting sometimes gets it back, but the resolution is set to 1024x768, changing it back to 1920x1200 results in a blank screen.
I called Dell and they had me change the Power Options to have the display never go off, which seemed to work.... that is until just a moment ago when I got back in and the monitor was "stuck" in power save mode (I'll be calling them again if an answer isn't found here).