I think we need more info
Is this a notebook ?
could we have the model # ?
when you say disapeared, the card disapeared physically ,?
the internet connection disapeared ?
the card is in the pc, but it has disapeared in windows ?
what os do you have ?
oh I see you did post the mod # I read 3 reviews and none of them mentioned wi-fi except this review
56K V.92 modem, 10/100/1000Mbps Gigabit Ethernet, dual-mode 802.11b/g
where at the end it says 802.11 b/g...so I guess it has onboard wireless
>>>>MOST NOTEBBOKS WITH ONBOARD WIRELESS , THERE IS ABUTTON OR KEY ON THE KEYBOARD TO TURN IT ON/OFF
go to control panel theb system, then the hardware tab, then devices, see if you see the wi-fi card see if there are red Xs or yellow triangles with an exclamation point.