Laptop shuts down automatically

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Hello,

My laptop had 2gb ram with Intel Pentium processor and my battery was flat so I used to work with the power supply on and nothing happened when I was using this was.I upgraded with Intel i5 processor and 8 GB RAM and nowadays it shuts down exactly at 30mins.Even wen I kept it in BIOS or turned it on for working it shuts down automatically exactly after 30 mins.
Help me out someone pls

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