Hello. So my computer that I built about 4 months ago has a problem that I cannot seem to fix. Nothing went wrong before this happened. Every time I turn it on says "Reboot and select proper boot device or insert boot media in selected boot device and press a key." I only have one ssd with no other harddrives or anything and it has windows 7 on it. It has all of my games because it's a custom gaming computer. I have no idea what to do so please help.