beeping while using laptop

Jul 15, 2018
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my lenovo idea pad 100 make beeping noise and does not work while using it.
when i use it for about 30 minutes, it makes 3 beeps . . . 3 beeps and so. while beeping noise occur it does not work.so i restart and use it and beeping again.

after five time restart process, it cannot boot up. therefore, i turnoff my laptops.
3hours later, it can boot up and after 10minutes of usage time it makes 3 beeping. . .3 beeping and so on.

please answer me what problem occurs in my laptop and how to fix it.