Blank dell screen

my dell lat d620 wont display anything but the back light comes on and boots properly. it also wont display on an external monitor.
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More about blank dell screen
  1. The motherboard or gpu is dead: this model has defective nvidia chip. If it's out of warranty you will have to replace the whole motherboard and cost 200-300 $


    you can check this forum:
    http://en.community.dell.com/support-forums/laptop/f/3519/t/19334033.aspx
  2. Does your Dell Latitude D620 have the Mobile Intel 945GM Express or the Mobile Intel 945PM Express chipset?

    If you have the Mobile Intel 945GM Express chipset then you have the Intel Integrated Graphics processor. If the Intel IGP is defective then the motherboard would need to be replaced since the chipset is soldered to the motherboard.

    If you have the Mobile Intel 945PM Express chipset then you would have the NVidia Quadro NVS110M discrete video controller. If the NVidia Quadro NVS110M is defective it should be replaceable.
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