TV flashes - HDMI issue on ATi 5750 - Update drivers?

[DaveLCR]

Hi all

Long time reader first time poster.

Received a Mini Displayport to HDMI adapter today, all excited

Every few seconds the screen goes green, I lose the image and sound, and things screw up.

After a lot of messing round trying various TVs, cables, computers, I've deduced that because it works correctly under W7 in BootCamp, it's got to be to do with the graphics card driver. (MacBook works fine on the same TV, iMac works fine on a different/older TV or in BootCamp on new TV)

Now -- I've had a quick Google but can't find the answer I'm after. Is it possible for me to update the graphics card driver by means other than Software Update? I've had a browse on the AMD site but can't find any SL drivers for the card.

For a Mid 2010 iMac 27"

This is really bugging me

Help appreciated

Dave

 

[DaveLCR]

In case it sparks any ideas, here's a 10 second clip that shows what happens when used from the iMac.

http://bit.ly/eZ3epc

 

[rkaufmann87]

Probably the adapter, exactly which one did you buy?

 

[DaveLCR]

It was the Moshi MDP -> HDMI Adapter.

If that was the issue, is it not strange that it works under the same system from Boot Camp??