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When I plug the power cable into my Lenovo laptop, it slows down, the CPU speed drops. I've taken my laptop to tech support several times, but nothing. Can you help me
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Specs Lenovo ThinkPad E550 Laptop 39.6 cm (15.6") Intel® Core™ i5 i5-5200U 4 GB DDR3L-SDRAM 500 GB HDD Windows 7 Professional Black, Graphite Laptops (20DF0054MH)
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