Sarcosomal computer

Hi guys, this problem, decided to buy a new case, and for this purpose pulled out all the insides of the computer, but due to the fact that I need it for games and entertainment, I picked and gathered all the details on the stool together, that is put the motherboard, attached hdd, ssd, video card, insert the cables from the PSU, monitor cables, the ribbon cable on the drive, everything as it was, but no. But here's the problem, the computer stopped working and it turned out that I tore off the wires that were responsible for starting the computer, but I put the reset for the launch site and everything seems to be decided, all starts, the fans are operating system began to run, and-and everything. Crashes error disk boot failed. Began to Google, was advised to disable the drive, just pulling the train, not helped, and other councils did not in practice, so guys, what to do? Could it be the reason that I incorrectly installed the cables? Because they do not remember their primary location, or did something broke? The only thing I can do is throw a picture here of the insides, so you can see where you inserted. Thanks in advance, we will help to solve the problem.