Video cards come in anti static bags, that being because static will kill them. A brush will kill a video card from making static, and I've seen other posts where this happened from a brush cleaning it and it never working again. There is a small chance that's not what happened, and I would hope your video card isn't dead, but it appears as if it is that way.
Now I realize what huge mistake I did. Even if isn't the case I won't clean a PC with a brush anymore. Thanks for the tip.
But, there is a new info. If I try to power on without the power cable plugged on the videocard the PC start but without display(I guess because doen't have enough power)