Laptop beeps sometimes while trying to turn it on and sometimes keys are automatically pressed, not physically.

[AyushAmitabh]

Sometimes my Laptop beeps and doesn't start, sometimes it beeps for 2-5 minutes and then starts and sometimes it starts smoothly.Also I have noticed that when power is low it beeps and when I try starting it after charging for a while, it starts smoothly, without beeping.Apart from this, I have also noticed that sometimes any one key gets pressed automatically. But sometimes everything runs smoothly. Also, there is not any specific key or keys that are found pressed.For example, one day 'windows' key was pressed, some days diff. alphabets are found pressed and for last 2-3 days '-' key is gett

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