Computer display problem

when i turn on my pc then it can not display screen.when i start my system it shows yellow light but not display red light and not show any output on my screen.
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More about computer display problem
  1. Which screen are you using?
    Are you using an onboard video input or is it a seperate graphics card? Is it VGA or DVI?
  2. At first check your screen cable connected to the cpu, then you have to check the RAM whether it is ok or there is problem in the RAM, then the last option is to check the Graphic card.
    check the link below.
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