Brand new laptop cuts out on startup - advice?

sollochs

Estimable
Aug 26, 2014
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My Lenovo z50-70 laptop is less than a week old, and every time I switch it on, it's fine, it gets to the start screen, but if I push any key on the keyboard, like the volume, brightness or enter key, it cuts out like the power was cut. So it's the first key I press after switching it on. Then I just switch it back on and everything is fine, no error messages or anything like that. It happens every time I switch it on. What's happening? Should I return it?