The new assembled computer does not turn on, is the problem in the power supply?

Question

Power Supply

Hello. For the first time I am assembling a computer, I connected everything, and it does not turn on, absolutely nothing reacts, I look inside and notice what is in the picture, the 5vsb cable is torn off to 20 + 4pin on the PSU. Of course, I’ll go to change it, but is this the only problem, or even if this cable is not working, should the computer start up?