MacBook Air not turn on, after hard disk eject, without guarantee

Hello i have two macbook air not turning on,
after ejecting external hard disk, when macbook air is sleeping.
External hardisk ( 2.5 sata) have one ending of USB Type mini-B
and two endings of cable (one for data, other for power), of USB Type A
After next sequence,
-insert one tail of usb cable into macbook air, the second usb cable into 5v adapter (like iPhone usb adapter)
-after some time macbook air going to sleep
-without waking macbook air, pull out the cable what connected into macbook air
MacBook Air will not turning on.
even after this instructions
http://support.apple.com/kb/ts1367
In nearest AppleStore they say that there is a problem with logic part of notebook,
And the minimal price of repair will be cost half price of macbook air.
In other words, they say what they will not searching the problem of this,
they only will replace mother board.
Would you suggest other solutions ?
May be somebody else have this problem ?

OK. I wasn't quite sure. So, the first thing to try is Resetting your Mac's PRAM and NVRAM followed by Intel-based Macs: Resetting the System Management Controller (SMC). If neither can be effected then take it in for service as there has been a serious hardware failure.

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