Not yet. I'm just arranging to head to the place it was bought from. It's going to be a pain. I live in Beijing, and though I've been learning Chinese for 4years it's still difficult. On top of that I didn't buy the computer from there, I bought it secondhand from a client of my girlfriends, who sells IT security systems, and though I have the receipt, the bulk of the internals have changed (different case, DVD, HDs, PSU), so it's not the computer they assembled, only part of it. I have a receipt, but all the explaining, all the steps I've taken to get to what I know now, will be... challenging.
But at least I know it has to be the mobo. I went to a shop and they kindly allowed me to use one of their shelved video cards for the 2nd time (didn't ask for money either), and I could not complete an installation of Win7 using two different video cards. In fact, using mine gets further than using some older ones. So... indeed, it is the motherboard.
Now, living without my main computer for x-weeks is going to be my next challenge, I feel like I'm preparing for monkhood.