Pc not Booting up and no Power when GPU is Plugged In

[donumimu]

I recently bought this 2nd hand msi Gtx 1080 armor oc and I did benchmark and play games on it for a day and Its fully working but later that day when my brother was using my PC there was a Power Outage, After that he says that he still manage to use it for an hour or two then it suddenly turned off then after that its not booting anymore.
I tried using my old gpu which is a gtx 660 and its powering up and everything but when I go back to my gtx 1080 its not booting or powering anything,
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I hope you guys can help me with this since I really need my Pc for my job

 

[SpyderTracks]

I recently bought this 2nd hand msi Gtx 1080 armor oc and I did benchmark and play games on it for a day and Its fully working but later that day when my brother was using my PC there was a Power Outage, After that he says that he still manage to use it for an hour or two then it suddenly turned off then after that its not booting anymore.
I tried using my old gpu which is a gtx 660 and its powering up and everything but when I go back to my gtx 1080 its not booting or powering anything,

I hope you guys can help me with this since I really need my Pc for my job

these forums are for support on PCSpecialist systems, so we can’t advise on self builds or competitor builds, you may want to check out toms hardware which is an open forum