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There is no screen when the computer is turned on, so the mouse and keyboard cannot be used.
Then I can only tell you that the mainframe is broken. It may be power supply, memory, motherboard, CPU, graphics card, and so on.
Exclusion sequential detection.
If you are lucky, you may be surprised if you press the parts inside a few times before opening them. . . I am a netizen of Manas Online. . Make friends!