New built pc turns on then off and it keeps repeating

[jpr148_1]

Hello everyone, I just built my first gaming pc, but whenever I turn it on it turns off then on again and repeats (I also don't hear any beep noise when it starts). The monitor doesn't display anything and my keyboard does not work either. I turned it on without the ram and still didn't work. I even took out the bios battery as well, but to no luck. I also unplugged the cables which still didn't work. I don't have another pc to see if any of the parts works or not, so I can't tell if it's my graphics, psu, mobo, or even the cpu.

If anyone can help I would appreciate it since this is my first time building a pc, so I don't know much.

Here is the link to the video where I got all the parts to build a pc.
https://www.youtube.com/watch?v=kSTqDqe52sY&t=363s

 

[jayjay291077]

take everything off the motherboard , start with PSU and CPU with monitor plugged into onboard port - does it boot too Bios? yes repeat for each part untill it stops or boots, also does your motherboard have anyboard LED's? most modern ones do, when i transplanted my system to a new case i bent a cpu pin and my system wouldn't boot, had a red light on the motherboard which the manual told me was the CPU, luckly for me i managed to save it lol -

 

[jpr148_1]

take everything off the motherboard , start with PSU and CPU with monitor plugged into onboard port - does it boot too Bios? yes repeat for each part untill it stops or boots, also does your motherboard have anyboard LED's? most modern ones do, when i transplanted my system to a new case i bent a cpu pin and my system wouldn't boot, had a red light on the motherboard which the manual told me was the CPU, luckly for me i managed to save it lol -

I took everything off the motherboard like you said, but it keeps turning on and off as usual

 

[jayjay291077]

sorry for the late reply, if you have tried with just CPU and power and the thing still isn't posting then sound you may have a problem with the CPU, check it is seated correctly, no bent pins etc, also does your motherboard have any LED lights on it? these will indicate where its falling down during the boot process.