Macbook Air not starting at all

Hi,
i have a MacBook Air 11" (mid 2011), purchased in Australia.
the other day I powered it down, unplugged the power, re-plugged, and it won't start at all.
no beeps, no fan noise.
Green light on the Magsafe connector.
Magsafe power works on a different Macbook.
checked Magsafe connection for dirt/debris.
tried with battery unplugged.
tried with SSD out.
tried SMC reset.
ordered and installed a new I/O Board.
i left it unplugged for a week.
still nothing,..
when it has power connected, the top/middle of the keyboard is warmer than the sides, indicating that power is getting in.
Unfortunately i'm in Mallorca, Spain, with no Genius bar available and only 3rd party repair shops.
So before I head off to be quoted an exhorbitant amount to replace the main board, are there any other magic suggestions out there ??
thanks in advance!

Back up all data before making any changes.
If you've installed something called "Memory Clean" or any other third-party software that is supposed to "clean" or "purge" memory automatically, remove it according to the developer's instructions and reboot. You should do that even if the software is not causing the problem, because it's useless.
If you've installed an equalizer called "Boom" or anything similar, update or delete it and reboot.
If there's no improvement, or if you're not aware of having installed anything that fits the description, post again.

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