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Hello and welcome to justanswer. My name is***** will be assisting you today. I am sorry to hear that you are having such trouble.
Please do the following
Remove the battery and any other peripheral device connected to the computer. Hold the power button for 10-15 seconds and then connect only the AC Adapter and try to turn ON the computer.
Ok lets do this
Is it only 1 long or short beep?
And now the screen just blank?
ok please hold down power button until it shutdown completely and restart normal again.
This can be due to memory fault as well
If possible can you check how many ram modules is installed?
This will require you to open the laptop
Please see link provided
No problem and thank you for using Just Answer and happy new year!!