Laptop writes by itself and then shuts down

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I have an Inspiron N4050 and i got it about year and a half ago and approximately every time i start it it starts write a code and it is as if i am pushing each letter on the keyboard and then it shuts down. i had the same problem before and they changed the hard drive and it worked fine for about 4 months before having the same problem again.

Any ideas?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References en.community.dell.com/support-forums/laptop/f/3518/t/19479144

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