My pc keeps turning on and off. I just built it and would like some help

[Puudii]

I just finished building my brand new pc. When i turned it on my monitor said "no signal detected." So i removed my ram sticks and put them back again. When i turned on the pc, it powered on for a couple seconds, then powered off, then powered up again for a couple seconds them powered off in a cycle.
I dont know if it was me pushing in the ram sticks too hard or something but i would like some help please
Thanks

 

[Paul NZ]

Whats the mobo and cpu?

 

[Puudii]

I have a Gigabyte GA-H170M-D3H and an i5 6500

 

[Paul NZ]

Did you install a GPU or are you using the onboard video?

 

[Puudii]

I installed a gigabyte gtx 1060

 

[Paul NZ]

Ok and what cable are you using for it to the monitor? Is it HDMI to HDMI, or DVI to DVI??

If it's VGA you need an active adapter

 

[Puudii]

Its vga to vga but since my graphics card only supports dvi and hdmi, im planning to go out and buy an hdmi cable today.

For now i have it plugged into my mobo

 

[Paul NZ]

So the mobo video works for now??

 

[Puudii]

I cant tell for sure. When i first powered on my pc my moniyor said no signal, so maybe it doesnt work. Right now it keeps turning on and off so i cant tell

 

[Puudii]

Do you have any suggestions in terms of my pc turning on and off?
I thought maybe it was the cpu heatsink that might have not touched the cpu, and although i didnt take off the heatsink to make sure, it looked like it was directly touching the cpu.
I also didnt see any thermal paste leaking to the sides(again, didnt take the heatsink off to make sure)
The only cause that i could find was maybe a faulty psu, but this is my very first custom built pc, so i thought coming here would maybe confirm that or someone might find a better solution

 

[Paul NZ]

Other thing it maybe is the cpu pins are bent or something. I would buy a mobo speaker see what that does

Did you connect the cpu fan, ATX12v as well?

 

[Puudii]

What excactly is a motherboard speaker?

 

[Paul NZ]

This

It plugs into the speaker header on the mobo

 

[Puudii]

Ok so i took out my cpu to check if there were any bent pins or thermal paste leakage. Not a single pin was bent and i reapplied the thermal paste and turned on the pc and the same thing happened PLEASE HELP I AM IN DEEP TROUBLE

Also id like to know how a mobo speaker would help in this issue