Why won't my macbook pro connect to the internet!?

First and foremost, this is definitely an issue with the Macbook. We have 2 PCs (desktops), 3 game systems and 2 Tivo's using the router (wired and wireless) without issue. We've also used a Windows laptop on the router, and aside from the occasional dropped connection, it worked fine as well.

We had a Netgear G router for 4 or 5 years that the Macbook worked just fine with, even after I dropped the Macbook hard enough to dent it once (oops). But recently the Netgear router died, so we bought a replacement: a DLink DIR-655 Wireless N Router. I went through the usual setup pains trying to get the router configuration just right so that all of our various machines could get on the Internet. Now we're at the point where everything works fine, except for the Macbook.

The Macbook will connect to the router, get an IP, and work as expected after a fresh boot. I'll close the lid to put the Macbook to sleep, but when I open the lid later, where the Macbook would automatically get a working connection before, there's now anywhere from a 40% to 70% chance that I'll actually get a working connection, even when manually connecting or trying any of the things listed below under "Things that sometimes work" and "Things that always work". The airport card is working. It picks up the SSID from the router, connects to the router, indicates it is "getting status", gets a self-assigned IP address, and then eventually drops the connection. It never gets a valid IP address from the router. Except sometimes when it does. Even though I'm not changing any settings on the router or Macbook. Once I do eventually get a valid IP and working connection, it's rock solid. See how frustrating this is?

Here are the facts and specs:

Router:
DLink DIR-655 Wireless N Router
G only
manual channel
broadcasting SSID
WPA - Personal / WPA - TKIP

Macbook Pro 3,1:
OS X 10.4.11
2.4GHz Intel Core 2 Duo
Airport Extreme 1.4.4

Attempted Fixes:
Setting router to one manual channel
Running permissions repair
Setting manual IP on Macbook and reserving IP on the router
Installing updates and patches on Macbook
Updating firmware on router
Deleting com.apple.internet*.plist files
Deleting all preferred networks
Deleting all keychain entries
Set "By default, join:" to Automatic or Preferred Networks
Turned off IPv6

Things that always work:
Rebooting Macbook
Rebooting router

Things that sometimes work:
Turn off/on airport card
Running Diagnostics

I've been a PC girl most of my life, so I freely admit I'm not a Mac expert. Is there something I'm missing here? Please help me get my Macbook's wireless connection back to normal before I throw it into a wall! I've extensively searched the internet for solutions and spent an inordinate amount of time attempting to fix the problem, but so far no dice. I'm hoping there's a Mac genius lurking on MeFi that can come to my rescue. Is there anything else I can try to fix this problem, or should I just resort to buying a new router? copyright ybarra-cgm

Source: http://ask.metafilter.com/105876/Why-oh-why-wont-my-Macbook-Pro-connect-to-the-wireless-Internet-after-sleep

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