Tried changing the voltages but no help. It's funny but what I found is that when I pull out one memory stick and restart the PC sees 4GB, then I shutdown again, insert the one I had pulled out in the same position as it was before, and voila I get 6GB. But I have to repeat this process every time. At 6GB once I shut down and start again I will only get shown 2GB and have to repeat the pulling out and putting back in process again. Pretty strange stuff, anyone seen this before ?