Wie heeft Ik ook gebruikt bij dit onderwerp

Hi all - sorry I made a mistake in the title, it's a MS-7848 card. 

I recently upgraded my partner's computer with an  MSI GTX1050ti 4G graphics card, but I haven't been able to get it to work. The computer won't boot up, and it gives me 1 long beep and two short beeps, which I've found online to mean video display error. The machine boots as normal when I use the integrated graphics card. 

Can someone tell me what I can do to get this to work? 

Thank you so much.