HELP!! NO AIRPORT, SOUND, USB, RAM SLOT NOT WORKING

A couple of days ago i opened up up my 06 macbook pro. i opened it up to clean the airvents bc the laptop was getting crazy hot.so I cleaned out all of the dust and when i put everything back together, it wouldnt boot. i got a black screen and the hd light was on (not blinking, solid). so i took out one of the memory sticks and it booted. but now that it booted it says i have "no built in output" "no airport card installed" and one of my usb ports isnt working and i was thinking maybe something wasnt connected to the LB but i went backed and triple checked adn all of the connections seem fine but idk. could it be possible that the logic board might have shorted out while i left it on the chair when i took it apart?? or it just might be a connection that i might have forgotten?? please help me as i dont have money to buy a new laptop. on the bright side the MBP doesnt get hot anymore.
thanks to anyone who helps me
also watching videos on safari was a problem, and i switched to chrome and it fixed it right up, but all of these problems happened at the same time. (not sure if relevant)
p.s i already tried a smc and pram reset

might be a connection that i might have forgotten??
It's possible. However, you already stated that you "triple checked." No harm in checking again incase you blinked too fast the 3 go-arounds.
Check out KB Articles: http://support.apple.com/kb/TS1367 Troubleshooting when your computer won't turn on and http://support.apple.com/kb/TS1365 Intel-Based Apple Portables: Troubleshooting a computer that will not power on
Another option would be to take your MBP to you local Apple Store or an AASP for a FREE diagnostic test. This way you will know exactly what is wrong & how to fix since it appears you know your way around the guts of a MBP.

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HELP!! NO AIRPORT, SOUND, USB, RAM SLOT NOT WORKING

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