Question My pc turns on and off

May 28, 2020
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My pc turns on till last year
Now when I frequently switched between GT 730 and GTX 550 ti several times my pc turns on and off
But when I give power to Mobo alone for 30 minutes and then it starts
But it does not start with one click
My spec
Intel db75en
16gb ram
GTX 550 ti
Corsair 450w psu
What can I do
I need this pc
Plzzz help me someone
 

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