thx alot for answering me !!!
i really try what u told me many times but it didnt work and nothing appear to me !!! so what else can i do??
mr. darkleaf actually i didnt istall my vidio card coz i didnt know the kind that i have to pick and i even didnt know if i have one coz it's not my computer and i just take it .. so while i was istall linux i didnt take any option from the vedio card!!
so plz if the problem with that ..can u tell me how to do it ???