Toshiba a100 laptop screen in 4 way split.

hi there i have a toshiba a100 which works fine except for the display is divided into 4 equal and identical parts. is this a known fault. what should i replace. i have reinstalled the os. with a format. and no change. same display on an external monitor when attached. thanks for your time. i should have mentioned that it is a divided screen even in bios setup. thanks for your help. jack
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  1. If it does the same on an external monitor, then your GPU/motherboard is bad.
  2. thanks for you time, i really did not want to attempt disassembly without some direction on what was the failure. thanks for yuour time. j
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