Question Pc starts in second boot

Aug 17, 2019
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So i was having problems 3 weeks ago my PC was not turning on , fan was turning of on repeatedly then after a week i tried starting it and it was working fine then i shut down my pc, after 6-5 hours that problem again started then i changed my ram location and it was working fine but then again that problem start when i shut it down and start it again after some hours But i removed my gpu thinking that repeatedly on off probelm will damage my gpu. Then after a week i started again it was giving 5 beeps i changed ram location and it starts then i inserted my gpu now problem is that when i boot my pc with with gpu first it starts turn off then starts perfeclty fine i don't why i am having this problem please help
(Sorry for bad English)

Corei5 3rd gen
Gpu: gtx 750
6gb ram