Macbook Pro not connecting to Home Wi-Fi but connects to work Wi-Fi

Hi there.
I am using Macbook Pro with Mac OS X 10.8.5. My Macbook is suddenly not getting wireless internet connection from my Wireless Router (It is connected to my Wi-Fi though). All other devices (iPhone, iPad, Windows PC) are connected to the same Router and have internet access without any problem. Same Macbook works fine with the Wi-Fi at work but having problem connecting to internet with Wi-Fi at home.
Well, I have been looking for the solution to this problem for a week now. Here is what I have already tried
- Zapped PRAM (didn’t work)
- Deleted System Configuration Folder in /Library/Preferences/ (didn’t work)
- Removed Network connections and tried adding them again in Wi-Fi Advanced Settings (didn’t work).
- Tried Apple’s Wireless Diagnostics (didn’t work)
- Tried Wireless Assistant (didn’t work)
- Tried creating new locations (didn’t work)
- Tried deleting and adding Wi-Fi service (didn’t work)
- Reset Router (didn’t work)
- Changed security setting in Router from WPA2 to open (didn’t work)
- Tried dscacheutil - flushcache
The only thing works is changing DNS server to 8.8.8.8 from default (192.168.1.1 which is greyed out). It works but speed is very slow which is already very annoying.
Need suggestions on what to do in this regard?

Solved! (for me anyhow).
I removed all entries in my 'Manage Networks' tab, and reentered the home network info (SSID is not broadcast, WPA), then the phone immediately found the network.
Mobile data happened to be on at the time (no idea if that has anything to do with it).
Chain of events
- received phone while out of town. everything worked as expected. no chance to try wifi on the road.
- returned home after holidays and tried wifi at home, no luck (like above). I did have some typos and all subsequent attempts to connect were via 'edits' to an existing network entry. Note, my laptops and Nook Color had no trouble connecting.
- went to work, wifi worked flawlessly in office as well as at local starbucks
- returned home and tried again, numerous attempts. no luck
- restarted router (TDS/actiontec GT724-WG) to no effect
- tried to reset router (forgot my pw, fortunately, it didn't reset)
- finally gave up, figured that I need to change some router setting- recall SSID is not broadcast, and using WPA
- grabbed a beer (the secret solution?), and had a thought to simply remove my earlier entries in the network list and reenter the correct info cleanly.
- phone immediately found network and connected- good to go!
Now, I really really like the phone (if I can just get Tango to work...)
Hope this helps someone.

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