How to resolve the problem of display in a computer system(siemens computer)

i have a pc computer that was formally working, recently after a thunder storm, i switched it off and it logged off as normal but when i was trying to reboot the system, nothing again was showing on the display screen. i changed the RAM and the Processor yet there was no display. what do i do?
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More about resolve problem display computer system siemens computer
  1. Does it beep or show any signs of life such as Motherboard light and DVD Drive flashing etc?
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