Howdy, I'm stumped here. I changed to sata HDD and sata dvd drive about 6 months ago. Yeah I know, what took so long right? I'm using the asus A8N-sli-premiun MOBO. All i did was take out the IDE drives and plug in the new sata drives. installed windows and it was working flawlessly for 6 months until last week when i turned it on and got a prompt to load a system disk. I noticed in the bios that neither the sata HDD or sata dvd drive was recognized. I do still have another IDE dvd drive hooked up and it was recognized. I tried changing the sata ports they were plugged into. I went from port 1 and 2 to using 3 and 4. It still wouldnt boot. I unplugged both sata devices and hook up an old IDE HDD and it booted and has worked fine. so i decided to plug in the sata dvd. It loaded windows ok but froze after it finished loading. If i plug in the sata HDD and not the sata dvd it will not load windows and just promt for a system disk. so i dont think the sata drives are the issue. what are the odds of both of them going bad at the same time? slim i would think. also cleared the cmos and checked the bios for anything i could have missed. not sure what. i didnt have to change anything in the bios to run the sata devices in the beginning. I suppose i could get a sata pci card to run my sata devices. Im interested in any ideas you might have. Thanks in advance for any advise you might have.