very common issue with Asus boards, they dont like OCZ RAM i think they said its a voltage issue, u have to run a highier voltage then normal for it to worked properly (as well as a bio flash) as Asus have addressed the issue, do a search on google you'll find 100's of threads on it.

If you've got some different brand ram throw, that in and it should work fine, just to see it really is the issue.