Okay, the replacement HDD appears to have eliminated the problem. Only restarted a few times, but it hasn't hung so far. Only issue I'm faced with now is getting Windows to recognise the HDD. The RAID controller sees it, but it's not showing in Explorer. I've tried re-applying the patch, but it says it's not needed or something. Or that it isn't supported. I've yet to try Ontrack 10. As well as uninstalling the patch and re-applying.