HELP! XBOX 360 HDMI not working on my TV
I bought the amazon xbox 360 deal and set it up last night. when connecting using the A/V Cable provided i get picture and sound so can play. The Problem i'm having is when connecting using HDMI i get no signal. I've used 2 different hdmi leads and still the same. These leads do work as i connect my laptop via hdmi to my TV. When the hdmi is connected with only the tv on i get no signal, i then switch the xbox on and the no signal disappears but still got a blank blue screen. My TV is low spec techsonic 26" LCD which supports 1080i. There are no settings to change for the HDMI on my TV as i have looked through the manual. can anyone help with this as i dont really want to buy a new tv yet?