Macbook Pro Wireless not detecting

I have a Macbook Pro Late 2009, I have Wireless connecting issue. whenever i turned on my Wifi from MBC macbook froze while turning on Wifi, For that i have to Manually shutdown by pressing Power button. I am adding one more issue when i am tring to turn on Macbook i have to hold power button atleast 4 secsonds to turn on my macbook, if i just hold and release the power button While light keep blinking, For that again i have to turn off my mac Manually.
When i connect ethernet cable to mbc internet works fine!!!

MacBook Pro with latest OS
Not according to your system information - Mac OS X (10.6.4)  The latest is 10.6.8 unless you have Lion which is 10.7.
If you in fact have Lion, unkown if the following applies.  You may need to post in the Lion community:
Change your router channel.  Sometimes this is all you will have to do.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations:  Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
System Preferences/Network- Unlock padlock.  Highlight Airport.  Network Name-select your name.  Click on the Advanced button.  Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined."  Click the OK button and lock the padlock.  Restart your computer.
http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
Other resources to check into:
How to diagnose and resolve Wi-Fi slow-downs
Pv6 troubleshooting
Mac OS X 10.6 Help:  Solving problems with connecting to the Internet
Solutions for connecting to the Internet, setting up a small network, and troubleshooting

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