Very odd thing happened, when i went to tweak some timings on 2*512 of redline, rebooted and the whole system powered off, i hadnt realised i left voltage low and clocked too high. So i restarted and heard the long beeps, checked the leds and was saying ram. Now i can only boot one stick in slot 1 (yellow furthest from cpu) and any other wont. Also the second stick wont boot at all, on its own or in dual/single with the other. Anyone had anything like this. Looks like another mushkin rma coming up.
amd 3500+ claw
dfi nf4 ultra-D
2*512 muchkin 4000 redline
ocz 520 powerstream.