Pc shutting off and rebooting after installing new sapphire itx compact radeon r9 285 graphics accelerator

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My father in law, just got a new graphics card. The sapphire itx compact radeon r9 285 graphics accelerator and a new 600 watt power cord. Ever since he put in the new graphics card the computer has been shutting off and rebooting. Is there anyone that can help me figure out what's going on? I'm not computer savvy and neither is he. :??:
 
I think we would need more data. What are the computer specs? I presume you mean power supply... buying a new cord would not help you. What brand and model power supply?

When does the computer shut off and reboot? Instantly? Randomly? Only while playing games?