Right now my video card isn't responding after the Ubuntu Logo is shown, (I see a black screen and that's it) I have installed ubuntu 12.04 AMD64 and if I remove the video card and use the VGA from the MOBO then I can use it with no problems, other data:

1. 4 GB of ram 1333
2. 500 GB WD
3. AMD APU A6 3500 2,1 GHZ

I forgot a couple of details, everything was working great until last night, when the light went off (I don't know if I'm explaining myself I'm from Argentina and english isn't my first language there was a power cut I meant) and then when it got back I used my pc until I went to bed (after upgrading) and this morning, when I woke up I had this problem for breakfast, I've been reading a little and I had a similar problem before and fixed it, but it was a system problem, a missing package or something, I don't remember, but here the only issue is that the video card doesn't give me image after the ubuntu logo.