[mythtv-users] new HDMI cable give no display

[Tim Draper]

upto now i've been using an unknown HDMI cable (came with sky+HD box, which
i've now sold). i've had to buy a new HDMI cable  to go with my mythtv
setup.
the local shop had 2 types, so i went for the more expensive HDMI 1.4
specced cable.

now when mythtv boots, i either get no display (with the tv switching
between wide and 16:9 ratio), or a load of snow over the screen (like an
untuned analogue tv signal).
i reboot the mythtv pc, and it shows a picture fine at bios level, just not
once mythbuntu starts booting.

i've been able to get into mythbuntu 'safe mode', enter safe graphics mode,
and re-configure the display. reboot as requested, but still no display once
mythbuntu starts to load.

annoying.
but whats even more annoying, is the cable works perfect with my HDMI laptop
(intel HD graphics) at 1080p.
since i bought 2 of the same cable, i try both; they both exhibit the same
issue with mythbuntu.

mythbuntu setup:
nvidia 210 gfx
mythbuntu 0.24

any ideas how i can fix this? i know it's a bit overkill, but i COULD
rebuild it from scratch if it came to it. i'm not very good with linux - i
can get my way around and usually understand what im doing when i follow a
guide, but not actually diagnosing issues.

oh, SSH and VNC works fine and mythtv seems to be fully working (hdd
activity when i use the controller to go around the menus), just im getting
no display..
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