Macbook Pro doesn't power up. How to make sure that's a logic board or IO board issue?

Hi there,
I've got Macbook Pro of this model http://everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-2-duo-2.16- 15-specs.html
It's quite old. but as his owner told me it was working properly. Just in one day it went down. If he remembers that correctly it happend after he connected external display to it. So on press of power button, laptop doesn't react at all, even no any blinks of LEDs.
When I connect MagSafe charge cable, LED lights up red/orange and starts to charge battery as usuall. green LED at the bottom of battery itself starts to blink. Can't say now does it charge or not I just have plugged it, but at least my quess some power comes through laptop to battery.
Power button still doesn no effect when pushed.
Are there any checklists or options to determine where is the problem?
Looking forward any feedbacks on that matter
Thank you in advance
Regards
Alex

Still not sure how to troubleshoot the issue properly!
Anyone?

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