Hmmmm, in theory, when I bought it, the guy told me there was a 1 gb graphic card, but there is no GPU afaik. And there are only 2 fans, one for CPU and one for PSU.

I was thinking what you said in the replacement order. It's cheaper. I'm thinking, following another suggestion, that I could take the computer to a technician who has a replacement PSU on hand, who could try to replace it just to see if it works, and if it does, charge me for it or a similar one.

edit: on the other hand, I was so not knowledgeable that I could've been scammed and I wouldn't have known that there was no graphic card after all. I paid extra!