Alright, I have a long story, but here it goes. I recently built my first computer. I have an optical drive, a kingston ssd, and a wd 1tb hdd. My OS(windows 8.1)is on my SSD. I've had it up and running with windows for a week, and so far its been great. Earlier today I was using it to browse the internet, when I decided to shut it down and take a nap. Around 3-4 hours later, I decided to boot it up again, but when I tried I kept getting the message to please select a valid boot device. It was very strange seeing as how it had been working just fine not long before. I repeatedly checked the connections of my sata cables, and everything seems to check out. I also went into the bios and tried to troubleshoot there with other information I could glean from the internet, to no avail. I tried constantly to set the boot order right, to boot override to the ssd, etc, but I keep getting the same message and my computer refuses to boot. I then started tinkering around with my windows 8 system builder dvd. I've gone through as much troubleshooting as I could and tried to refresh my pc, auto repair it, and even restore it. I've gone through some command prompts as well such as CHKDSK and it says that a few things are wrong. However, it won't let me use the /f command to fix any issues I may have. Ive also tried using other command prompts recommended by microsofts website to allow the computer to reset itself or refresh itself, but simply nothing works. I need help badly. I've been researching threads for hours and trying things but nothing seems to work. I'm pretty new to the pc community and don't understand a lot, and a lot of the stuff I'm seeing is very complicated. Anyway, like I said I could really use some help as the figuring out the issue, whether its my SSD, which still shows up in the bios and is hopefully not dead, or windows not being able to repair or whatever the issue may be. Any advice would be appreciated and would really make my Christmas. Thanks for reading, and please help!