I bought a graphics card for parts and a new power supply, however, the computer still shuts down.

[magri_eman]

As stated above. Can there be something else causing the computer to just instantly shut down?

 

[Dark Lord of Tech]

When I had this issue with my Asrock my was my board , but other things can cause it too.

 

[clarkjd]

Can you list makes & models of the PSU and other components of your system?