Just installed airport card but can't get a solid signal

a few weeks ago an electrical storm blew out my ehternet port. i consulted a mac genius at the apple store and decided to avoid replacing my logic board by getting an airport card and wireless router. After installing this business last night i was delighted to see full bars on the signal icon. but then it instantly dropped to two bars. then none. then a few minutes later back to two, full, none, etc. My computer and the wireless router are pretty much right next to eachother- i'm not splitting the cable between my machine and anything else (no other computers, not the tv). can anyone suggest what might be causing the signal problem? there's a major heatwave, would that cause problems? also, should i have looked into getting an aditional ethernet card instead? i'm desparately trying to avoid taking my machine out of my house (it's a desktop and i live in Queens so it's a b-tch to take into the city) so i'm really hoping to make this wireless buisness work. thanks so much!

j9fleri, Welcome to the discussion area!
One (or more) of the following must be true:
The antenna wire isn't properly attached to the AirPort card. Is this the original AirPort card or the AirPort Extreme card? If it is the AirPort Extreme card, use the photos in KB 108039, Properly attaching the antenna on an AirPort Extreme Card to verify that the antenna wire is properly installed.
You are experiencing some sever RF interference. See KB 58543, AirPort: Potential sources of interference.
The wireless router isn't working properly.

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