I've connected my Macbook up to my external display which natively supports 1680 x 1050. However, when i connect it up it just goes into sleep mode (on my external display when i set the output at 1680x1050 on my Mac). The odd thing here is that, when i set the output at 1280 x 1024 (on my mac for the external display in system preferences) it works fine on my external display. Although, the quality is rubbish and all stretched out on my external display when set to 1280 x 1024 from my Mac. Anyone know why its not working when i set my native resolution for my display in system preferences? Any input is really appreciated, especially when i spent £25 on an adapter to connect my Mac up.