MacBook Pro won't start after I completed my first backup using TimeMachine

Hello,
My MacBook Pro won't restart after I did my first TimeMachine backup. I tried in SafeMode but no luck. My MacBook Pro is a 2009 early version running Snow Leopard. Please help.
Thanks,
Serey

I have managed to get into my computer through the OS X install disk but now my wi fi hardware is gone. Ie no airport.
When I try to re install the airport extreme wi fi base station software it tells me it can't be installed as this version of Mac OS X (Lion) on is volume is not supported.
Not even an Ethernet cable gets me on line. In system preferences when I do a network diagnostic all I get is the spinning disk. Again, any ideas how to get around this?
Thanks

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MacBook Pro won't start after I completed my first backup using TimeMachine

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