Pc turns on but shows nothing

Dec 5, 2018
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My computer was working fine earlier but then I tried to install Ubuntu but it failed after that when I tried to restart the pc it started but the monitor was blank and a small white dot was beeping on the upper left corner of the screen . I restarted the pc couple of times but nothing changed. Then I restored my bios settings back to default but nothing changed . Can anyone tell me what should I do?