so, my sister built me this cheap little computer and works pretty well...a little slow. anyway, a few days ago she had taken the antenna off of the back so that she could use it (as she lost her own and couldn't pick up a wifi signal). when she gave it back to me, i went to screw it back of and my airlink wifi card popped out. she told me just to open up the case and push it back in, and that i did not need to turn the computer off for this. i opened up the case and as i was trying to figure out where the card went, a piece of it hit the motherboard and it sparked a little. i plugged it in and closed the case back up, but i didn't get a wifi signal. so, i turned the computer off this time, opened it back up, took out the wifi card and then pushed it back in again. i turned the computer back on and everything worked fine...except... now i have no sound. i checked the speakers, volume controls, ect...all fine. i also uninstalled and reinstalled my sound device, went into "services" in the "administrative tools file" to make sure everything was enabled...(i heard that could be the problem), and re-downloaded my sound device. but i still have no sound. is the next step, a new sound card?