Computer not posting on startup

[xHades]

My girlfriend's computer recently died, and I took the opportunity to switch some of her parts. I got her a AMD Ryzen 5 1600 for the cpu, and a MSI B450-A Pro motherboard as her new pieces. The rest were stock pieces from the pc we bought. The entire system was roughly 2 years old. But upon installing the new motherboard and cpu, the computer isn't posting when powered on, and I need some help.

[Skiiwee29]

You do have a GPU installed correct?

[xHades]

4 minutes ago, Skiiwee29 said:

You do have a GPU installed correct?

Opened the socket, pushed till is clicked in, gpu fans are spinning, still nothing

[Skiiwee29]

1 minute ago, xHades said:

Opened the socket, pushed till is clicked in, cpu fans are spinning, still nothing

can you list out the full system specs part by part please?

[xHades]

9 minutes ago, Skiiwee29 said:

can you list out the full system specs part by part please?

Amd ryzen 5 1600

Amd provided cpu fan

Msi b450-a pro max

2x8 corsair vengence

1tb western digital nand ssd

1tb toshiba hdd

Gigabyte Gtx 960 (stock piece i am reusing)

Soly tech 400 w power supply (stock piece i am reusing)

[IkeaGnome]

6 minutes ago, xHades said:

Amd ryzen 5 1600

Amd provided cpu fan

Msi b450-a pro max

2x8 corsair vengence

1tb western digital nand ssd

1tb toshiba hdd

Gigabyte Gtx 960 (stock piece i am reusing)

Soly tech 400 w power supply (stock piece i am reusing)

When you try to power on, are any lights or fans spinning?

[xHades]

4 minutes ago, IkeaGnome said:

When you try to power on, are any lights or fans spinning?

Everything turns on, everything starts spinning, even tried to plug in my monitor directly to motherboard rather than my graphics card, no post

[SlashedM]

55 minutes ago, xHades said:

even tried to plug in my monitor directly to motherboard rather than my graphics card, no post

that wouldnt help as the 1600 has no iGPU anyways