Help Please! A few days ago my PC (which i have had about 2 years running xubuntu) started randomly crashing. i tried all the usual stuff (swapping ram, psu etc.) and have narrowed it down to this but do not understand why. If I use VESA graphics driver all is ok,both when using internal graphics and when using my nvidia 6200 card- however vesa won't allow twin monitor setup which i have been using.if i use either nouveau or nvidia drivers crashes happen at random but very frequently. if i disconnect nvidia card and use internal graphics with appropriate driver still crashes-but vesa driver is fine. anyone any ideas what's happening? vesa works on both internal and nvidia card but other drivers cause crashes on either internal graphics with nvidia unplugged or with nvidia card. any ideas would be so appreciated. thanks.