At the end of this thread (
2nd MCE PC) there is some a link to the asus website recommending some "fixes" to this problem.
Due to the fact i stuffed up my M2A-VM HDMI with all the constant shuffling of kit to get this working I can't try any of them
My M2N-MX Se and a 7300gt are working fine and the first rule of HTPC's is dont fix what aint broke
You guys feel free though, my M2A-VM HDMI got rma-ed and is currently sitting in my cupboard. If this problem gets resolved I may resurrect it!!!