My MacBook Pro detects wireless, but says 'no internet connection'

My MacBook Pro can detect my wireless and attempts to connect, but then says there is 'no internet connection' with an exclamation mark in the Wi-Fi icon at the top corner of the screen.
I purchased the Mac at the Beginning of September and has been fine. Now in November, it has only just started having problems.
My PC's in the household have no problem connecting. How do i resolve this?

Change your router channel number. Most times this works & is all you have to do.
See KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

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Why is my Macbook Pro downloading so slowly and losing internet connection frequently?

Write off the MS stuff as indicators for now--starting with Office 2008, they developed very long launch times. The time to launch 2008 on my old 1.25Ghz G4 and my MBP 2.2G are virtually the same. Even document opens/saves are slow compared to Office 2004 and earlier.
1) You have adequate hard drive space so that eliminates one of the usual suspects.
2) Check for runaway background processes. Quit all running user applications so the computer is at normal idle. Find Activity Monitor in Applications > Utilities and launch it. If you've not run it before, change the "Show" pulldown at the top of the AM window from its default of "User Processes" to "All Processes." There is a column for "%CPU." Click that column header to sort by CPU usage. Watch the processes "bubble" for about a minute to get a better picture of the usage.
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Why does my macbook say theres wifi but says no internet connection

can someone help me fix my wifi because it says no internet connection but shows full wifi bars. every other apple product is working

Change your router channel number. Most times this works & is all you have to do.
See KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

When i open my macbook pro the wifi connect but says no internet connection

Every time i close my Macbook Pro (early 2011 model running OSX Lion) then open it back up the wifi will connect to the right network but says i have no internet connection this lasts for about 5-10 minutes then the internet will finally work. i know it's not the router cause im connected on my phone and on other computers and they work just fine. is this something internal or something with the software?

Hi..
Try Resetting the System Management Controller (SMC)

T510 can connect to wireless but has no internet connectivity on working wifi's

Hi,
I have a T510 with an Intel agn wireless card. On some wifi (always G), it finds the access point. It gets the proper information from the router (proper gateway, dns, ip), but no internet connectivity. The router is working fine (checked by using other computers)
If you run the lower level intel diagnostic it fails on the ping.
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No Zone Alarm, No firewall running, No virus protection enabled.
thoughts?
The machine is 2 weeks old.
thanks,
stevew

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Microsoft Windows Vista Home Premium Edition Service Pack 1 (Build 6001)
To Be Filled By O.E.M. ConRoeXFire-eSATA2.
iTunes 8.1.0.51
QuickTime 7.6
FairPlay 1.2.12
iPod Updater Library 8.1d19
CD Driver 2.1.0.0
CD Driver DLL 2.1.1.1
Apple Mobile Device 2.4.0.27
Apple Mobile Device Driver 1.40.0.0
Bonjour 1.0.6.2 (118.5)
iTunes Serial Number ##########
Current user is not an administrator.
The current local date and time is 2009-03-18 13:45:40.
iTunes is not running in safe mode.
Video Display Information
ATI Technologies Inc., Sapphire RADEON X1600 PRO
ATI Technologies Inc., Sapphire RADEON X1600 PRO Secondary
** External Plug-ins Information **
Plug-in Name: LyricsSeeker plugin for iTunes, v2.1
Plug-in Loaded: Yes
Plug-in Version: 0.8
Plug-in File Version: 2.0.0.1
Plug-in Path: C:\Program Files\iTunes\Plug-ins\LyricsSeeker-iTunes.dll
** Network Connectivity Tests **
Network Adapter Information
Adapter Name: {25F3A7E0-58DD-4D94-97DA-9FC95C1BD8A1}
Description: Realtek RTL8168/8111 Family PCI-E Gigabit Ethernet NIC (NDIS 6.0)
IP Address: #########
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DHCP Server: 192.168.1.###
Lease Obtained: Wed Mar 18 02:52:05 2009
Lease Expires: Thu Mar 19 02:52:05 2009
DNS Servers: 192.168.1.###
192.168.1.###
Active Connection: (none)
Connected: No
Online: No
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Using LAN: No
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled
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Connection attempt to Apple web site was successful.
Connection attempt to iTunes Store was successful.
Secure connection attempt to iTunes Store was successful.
Secure connection attempt to iPhone activation server was successful.
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iPodService 8.1.0.51 is currently running.
iTunesHelper 8.1.0.51 is currently running.
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Message was edited by: UofMBob

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sorry you say your built in trackpad. and your built in keyboard. reboot. reset your pram. maybe your smc
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Back up all data.
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Troubleshooting wireless mouse and keyboard issues
http://support.apple.com/kb/ts3048
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My MacBook Pro detects wireless, but says 'no internet connection'

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