My Hp pro book 4415s will not power up? We bought it in 2010.

I have a pro book 4415s notebook purchased in 2010. Although the power cable is new ...the laptop power light only flashes yellow yet the computer won't turn on

its either the power supply or motherboard that's affected , I see you've done most of what needs to be checked for no power issues , you may wanna try step number 9  on this link
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&​dlc=en&docname=bph06788&lc=en&product=376070&tmp_t​...

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