Question Do I need a more powerful PSU?

[Zane Allman]

So basically a long time ago I got a $750ish pre-built gaming pc from best buy, I just now bought some upgrades such as an Asus Rog motherboard and a Radeon 570 graphics card, I'm not sure what the power supply is currently but I started up my computer and everything I enter a game an error comes up and my computer shuts down, I'm not sure if its because of the power supply or something but that's what I'm assuming it is, if I upgrade that, what would I need to upgrade it to? I'm looking for cheap, I'm 15 so my price range is not very high.

 

[Eugene$$]

Name of your psu?

 

[Vic 40]

For the psu need maker+model+wattage.

What can you spend on a psu?