OK, so if anyone could explain this mystery to me, I would be very grateful.
See, I recently purchased a new Bluray player for the sake of being able to play Bluray discs region-free. (It's the "Oppo" label, if that helps.) Here's where things take a turn for the strange, though.
See, since my monitor screen has only one HDMI socket, I got a HDMI switch for the sake of being able to connect both my old Bluray player and my Xbox360. So when I got my new Bluray player and plugged it into the HDMI switch, I had some problems getting the image on the monitor screen until I found out that it would only show if either my old Bluray player or my Xbox was switched on as well, even when the switchbox was set to my newest Bluray player. (And yes, I tried connecting it directly to my screen. There was no problems there.)
Needless to say, I find this extremely puzzling. If any of you guys have an idea what's doing this and can explain it to me in "electronics for newbies" terms, I would be very grateful.