Acer veriton x2611 restarts by itself then sounds 3 short beeps and there is no display

Yesterday I turned on my computer after coming home from school, at first everything went smoothly until I idled the computer for 20 or 30 minutes, suddenly the computer turned off and on again repeatedly, I have tried replacing the PSU cable and it turns out the computer runs normally until finally the computer still restarts but there is a short beep sound 3 times then the computer does not display anything, what do you think the problem is?

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