Have a bit of a problem when it comes to connecting my laptop to the TV via HDMI.

When streaming movies online on the laptop, its good quality, no buffering and pages load fast enough (only getting 6MB broadband but due to upgrade shortly). But, when I plug the HDMI lead into the laptop the internet connection goes really really slow, to the point that the movie wont play and just buffers, and when I plug it out, the movie plays instantly!

It's a new lead, a Grundig 1.4 HDMI lead, so it's not cheap lead at €2.99. Is there any settings I can change to stop this?

Also the internet in general just lags when I plug HDMI in, and wont even load google.

Any help is very appreciated Thanks