I'm not sure if I'm having the same problem as everyone else, I was able to watch a video with HDMI on my first HDMI monitor (Hanns-G 28")... However--
every time I turn on the 510 it's in AV/composite mode.
switching to HDMI takes much patience, the devices/settings have to be powered on and set in just the right order, with only a few seconds of leeway or it'll auto-cancel. (start in Composite, tell 510 to use HDMI but don't hit OK yet, turn monitor to HDMI, wait 1-2 seconds, press "OK, (wait 4 sec) Arrow, OK" to say yes I can see it even though I can't yet, and in 5-10 seconds the signal can be seen)
then if the monitor EVER gets turned of or goes to "sleep" all the above steps must be repeated.
...AND NOW... I went and bought an expensive new tv (Philips 42" 3000series) JUST FOR with the 510, thinking maybe a real TV instead of a computer monitor, would be more compatible. And now the above method doesn't even work. It never recognizes the big TV at all. Firmware 1.08 installed of course, before I even saw these forums. Completely Sucktastic.
so far, the IDEA that is this box has cost me almost a Grand and still doesn't do what I bought it for (or do it right, anyway).
ANY help with this? at all?
-on a good note, though, I use a DNS-323 as media server and it works great without ANY software installed.