Pc turns on then immediate back off

[Willyboy]

I recently bought a new motherboard, case, and power supply for a computer I’m building. I’m taking some of the old parts(like the hard drives, WiFi card, ram, and PCU along with its fan) from my HP pavilion 570-p064. After moving everything over, the RGB on the mother board would light up how ever when I would turn the computer on it would immediately shut back down. Anyone know why this could be? I’ve stuck on this for days now and I feel like it’s probably something really simple, thanks!

The specs:
7th gen intel core i3-7100 processor.
Crucial 8GB DDR4-2666 UDIMM ram.
Asus TUF B360M-plus gaming s motherboard.
Corsair CX750M power supply.
The next parts on this list came from the old computer.
1 TB HDD.
128GB PCIe NVMe M.2 Solid state drive.
Wireless lan 802.11a/b/g/n/ac (1x1) and Bluetooth 4.2 M.2.

[jmarket]

Try building the PC outside of the case on a non conductive surface, in case anything is shorting. Also did you notice the I3-7100 is not in the list of supported CPUs according to the web page for the motherboard you quote?

[ATTACH type=“full” alt=“4956”]4956[/ATTACH]

[Willyboy]

Oh ok so how would I fix the shorting issue? I realize I need a new CPU now but I would like to now how to fix the shorting issue for in the future. Thank you for your help I’ve been stuck on this for a while now!

[Rustys]

There should be risers that have to be installed between the case and the motherboard some cases have them builtin.

[Willyboy]

There should be risers that have to be installed between the case and the motherboard some cases have them builtin.

I already have those in there. Is there anything else that would cause that?

[Rustys]

Once you get the proper CPU and installed using the proper amount of thermal paste is when it should be checked.

Right now it is probably like @gus stated about the CPU in post #2.

[Willyboy]

Once you get the proper CPU and installed using the proper amount of thermal paste is when it should be checked.

Right now it is probably like @gus stated about the CPU in post #2.

Oh ok thank you

[Rustys]

Not a problem what operating system are you planning to install?

[Willyboy]

Not a problem what operating system are you planning to install?

I’m using the old drives from my other pc with windows 10 on it. Also I went to put the old pc back together and it would come on out side of the case but not inside. Instead it would turn in and off repeatedly until I turned off the power supply. Any reason for this?

[Rustys]

I’m using the old drives from my other pc with windows 10 on it.

Windows 10 and the license is attached to the old system will need to do a fresh install and get a new license.

Also I went to put the old pc back together and it would come on out side of the case but not inside. Instead it would turn in and off repeatedly until I turned off the power supply

The motherboard may be shorting out onto the case.
Need new thermal paste.

[jmarket]

it would come on out side of the case but not inside. Instead it would turn in and off repeatedly until I turned off the power supply. Any reason for this?

Yep, something is shorting inside the case, OR you have connected something wrong inside the case. Have a look at your standoffs, are there more standoffs than necessary for the motherboard, if so remove them. This is the reason I recommended you install the pc outside of the case in post number 2.

[Willyboy]

Windows 10 and the license is attached to the old system will need to do a fresh install and get a new license.
The motherboard may be shorting out onto the case.
Need new thermal paste.

Ok so I’m feeling kind of dumb right now but I have the old pc put back together outside of the case and I put new thermal paste on the PCU. However it still cuts on and off repeatedly when I try to start it.

[jmarket]

Have you tried using a compatible cpu?

[phillpower2]

Any update Willyboy?

[Willyboy]

Any update Willyboy?

I’m supposed to be getting the new PCU Wednesday. Your good to close the forum if you want