It didn't fit my cast meaning I couldn't jam it in the case but its not a major problem I just used my SATA Optical drive from my other computer and it fit. I don't believe the PSU manual had all that info but I can always try to double check. I have tried putting a second HDD. The hard drive has an OS and everything else I have in it. But when it started booting it would load the windows to where you see the green bars (loading screen) going then it would reboot(crash) and you get a glimpse of a blue screen. (blue screen of death?) I've only tried it once but I guess I can try it again. I'll try to make sure it isn't a HDD problem and see if I can use the new HDD on my old computer. I'll try to get pictures of what I've got plugged in and post em. So I've built the computer and tried to run it for the first time. It seems to start up fine you see the Gigabyte logo and it allows me to go into Bios after all that, a normal computer would start loading OS if they had one which I don't so it just says Loading Operating System and gets stuck there. Although I on my first initial boot up it actually asked for me to put a CD in so I just put my Windows XP CD Key it seemed to be installing normally but after a minute it crashed and give me the blue screen. So ever since then its just been stuck on Loading Operating System. I'm not exactly sure what to look for to see if RAM and CPU is listed correctly or not but I'll go check again and post pictures of those too if needed. It actually doesn't even ask me to press any key. It just gets stuck on Loading Operating System... _ As of this point the CDs I have for OS none of them are loading.