Yes, I've been using Tiny Core Linux to boot the PXn displays via a USB stick to test it out before I install it on the internal SSD. I've got Tiny Core Linux to boot straight into Opera web browser in kiosk mode and pointed it at an apache/php web server on our LAN. I can wake-on-lan the displays and send a 'poweroff' command to linux remotely, but the last piece in the plan is to shut the monitor down properly..
I've recently discovered 'xibo', some open source signage software which looks brilliant, and may go with that instead as there's no point in me reinventing something already done very well..
I still have the same problem though: shutting down the PXn's display.
More investigation has revealed that only Samsung's MagicNetX software can shut the monitor down. If I manually shut down WinXPe the display's backlight stays on (just like linux). I've discovered (in Windows Device Manager) that there's an i2c chip registered with a special Samsung driver. I reckon this is the thing that links the IR remote control and the monitor power to/from the embedded PC.
Linux also detects a Samsung SMBus chip, which looks promising. There must be a way of interrogating the SMBus chip using some linux i2c tools and seeing what happens, but I've got to learn how to do it first

And then, if I want to stick with xibo, I've got to make it work in WinXPe.
If only there were a command switch to MagicNetX which shut down the display instead of running it

Anyone got any ideas?
Tim