This is an update: I soon got a Belkin Wireless N router (MIMO) and it seems to be my macbook having the problem now. It keeps going down to 2 bars, (4 bars) all bars and so on. 3 bars seem to be when it drops. Is it the macbook? I tried all solutions. No success.
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your in an apartment an there are several more 2 ghz wireless near , you can change channels on the router an that will help.
they have a default .
this means every machine needs to be changed that contact the router wireless.
or get dual band router an a 6ghz cisco usb wireless 10.00 adapter from amazon
try reseating the wireless card or airport card. if that doesnt work. turn off your wireless router and your macbook. leave off for 10 mins then turn on the router first then macbook. try to connect and see if that fixes the problem.
The antennas in the Macbook Pros have had an issue with reception due to the aluminum housing of the laptop but, should still receive decent reception just not as much as a plastic Macbook or plastic PC laptop. It could be possible that the antenna's cables have become disconnected from the Airport Extreme card inside your Macbook Pro, that the card itself is faulty or damaged or that the Antennas themselves have been damaged in some way. As always make sure you have the latest updates and have installed any driver updates from Apple regarding your Airport Extreme card. Here's an article that may help eliminate any wireless interference that may be affecting your signal strength. Apple - Wireless Interference hope this helps, if so don't forget to comment, vote, etc. Thank you.
You need to check your network card software your problem may lay there. I've seen this problem many times in the passed. I will install a wireless network card or software on someones computer and two days later it will not connect everything looks fine. No matter what I do it will not connect. Remove net software for the card or on board wireless reinstall and boom it works fine.
routers may need reset or configured off the internet or the start up cd. I take this a wireless router hooked to internet gateway. don't know not enough information you may need to tell me a little more. first try install of net-card software then set you working router to unsecure no pass word need see if you connect then change it to you wpa password protected.
you should try a software update first along with a PRAM and SMC update (hold the power button down when the computer is off for 15 seconds-it will beep. immediately after that hold down the Apple, option, P and R keys simultaneously until the computer reboots and chimes 3 times)