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hp compaq presario v3412tu no display on laptop screen, just external display

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http://www.linuxquestions.org – hi there, im considerably new to linux n am very interested in using linux. i am trying to install linux on my laptop. im had try to install/use liveCD some linux distro on my laptop and most of them will not display on the laptop's screen, bt if i connect it to an external display (e.g. monitor, projector) the diplay is there and working perfectly. i tried to switch to laptop display using fn key bt with no success :( The laptop display did "blinks" (flashing white and black) thou then with external display attatched, went around and found the display setting window, clicked the detect display(s) button and it just identify the external display only. the laptop display also blinks during the process. some of the spec of my laptop: intel core duo t2450 2.5GB RAM 120GB HDD mobile intel 945 chipset broadcom 802.11b/g wireless intel pro/100 ve the linux distro tried so far linux mint, ubuntu(gnome, KDE, Xfce), fedora only 2 distro so far that donot have this problem: mandriva 2008 CentOS5.4 liveCD help me please... sorry if i do not reply in a timely manner, as i do not have constant internet access in my home. do inform me if u need any more information, thx for your time (HowTos)