Power supply, led turns red and computer not sarts

My brother have a power suplly Tagan TG780-U33II

When he turns on the computer, the poer supllies led turns red, and the computer not starting.

Usally the led of the bakc of the power suplliues light orange in standby, and swith the green when the computer stars.

But now it light red, and the comter not starting, what the means of the red light.
I have could not find anytgin about in the documentation and a google search.

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More about power supply turns computer sarts
  1. i would suspect that either the fuse is blown, or some other catastrophic failure within the PSU, i would recommend a new one built by corsair, PC power and cooling, seasonic, or enermax
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