Okay, so i recently bought an A8N-SLI mobo and a 300GB SATA Diamondmax 10 hard drive, and when i first set it up, it worked. However, after restarting a few times, the DM10 no longer showed up in the bios, nor could windows detect it. After fiddling around with it, it finally recognized the drive again, but about 2 hours later, when i rebooted, it stopped recognizing it, and would not do it again. The backup SATA silicon image drive's raid utility also seemed to pick up the drive's existence, but that's it. So i called Asus, and they said it was either a grounding issue or a dead SATA controller. So i returned the mobo, and ordered a Chaintech VNF4/Ultra, since it was cheaper, faster than an RMA, and had less extraneous features. It came in yesterday, and started up fine. Then, after a few restarts, it again stopped being recognized, and after a lot of fiddling, it got recognized again, but then after a restart it was gone. So obviously it's not a bad mobo, i assumed. So i checked grounding - thinking that might be the problem, i looked at my case, and saw that some of the standoffs were embedded into the case, and were aluminum, not brass. Thinking this could be the problem, i taped them over, but it didn't help. Then, i placed it in a new case, with all brass standoffs, but that didn't fix it either. Then i figured the HDD wasn't working, so i put it in my friends computer, and it recognized it every time. Also, since whenever the hard drive is recognized, it boots into windows just fine, i figured the drive was functioning correctly. So, at this point, i'm pretty much out of ideas. Has anyone had a similar problem with either the NF4 or the DM10? Is there anything i can do, other than return this HDD for one that isn't so new? My PC's been down for like 3 weeks now, and i need a fix fast!