Question Computer won’t turn on after new psu

Nov 10, 2019
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just got the corsair rm750 to replace my faulty rosewill psu i took the power supply out and plugged all the cables in and when i turned it on it flashed for half a second and the fans spun a little on my z370 ez bug led it flashes the cpu, i tried plugging my old psu back in and it wouldn’t turn on i’ve been trying for hours please help me
 

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Titan
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Mar 16, 2013
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just got the corsair rm750 to replace my faulty rosewill psu i took the power supply out and plugged all the cables in and when i turned it on it flashed for half a second and the fans spun a little on my z370 ez bug led it flashes the cpu, i tried plugging my old psu back in and it wouldn’t turn on i’ve been trying for hours please help me
Was the old Rosewill a modular PSU?
If so, did you leave the original cables in place, and connect them to the new Corsair?
 

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