Question about FUJITSU Desktop PC

[Eliiots]

Hello guys, can anyone tell me if I will be able to change the PSU for this PC "FUJITSU Desktop ESPRIMO P556/E85+" as i need to buy GTX 750 TI for my PC, but i'm not sure if i will be able to change it because i heared that if i changed a PSU for pre-built PC, the PSU may damage the motherboard.

 

[Eliiots]

Bump