Computer won't boot into windows

[Piggy]

So basically after returning from a long day at work and I just wanted to watch netflix, I discovered that my display wasn't getting a signal, if I pulled my DP cord out and back in, it would turn on like its gonna display something, but then just say no signal and turn back off. I reset the CMOS after this, but that did nothing except make my SSD not work later. I finally used a DVI instead of a DP, and now it's displaying things, but not booting into windows. I am getting an error code on my motherboard, and I just have a flashing underscore on my monitor. I have looked everywhere and tried everything I could find and still getting the same results. Help is greatly appreciated. My build should be in my signature 

[Yuiry]

Do you have pictures of what the monitor says/looks like during post ? Whats the error you get on your motherboard? if your motherboard has a manual it should tell you what to look for.

[Piggy]

I figured it out. It was trying to boot to my external even though I specified boot to my SSD. 

[Yuiry]

Mmkay,  You should always check your bios bootup, If this happens, As it's some times very simple things, Im guessing your bios was reset, and that the HDD/ E- HDD came up first which did not have the OS.