2.4Ghz MacBook Pro 2010 model doesw not connect to n network.

I have three Mac's one iMac, one Mac Mini (2010) and a brand new 13" MacBook Pro. I am using a Buffalo WHR-HP-GN wireless N router. All the computers except the MacBook Pro connect at N speeds, but the MacBook Pro connects at G speeds. All the computers are in the same room so distance is not the problem. I thought interference was the problem, so I turned off WiFi on the other computers and used Ethernet cables. Still the MacBook Pro would not connect at N speeds. I brought it to the Apple store and it connects at N speeds there. Any ideas why it will not connect here at home?

Yes it helps clarify, but no it doesn't answer your particular problem. The Wireless Network Access: Allow All would be the parameter I asked about.
You indicated it was 802.11b (only?) network. If so, it would be a pretty old unit. Linksys Model ?what? Perhaps you should check its firmware and see if there have been updates posted on the Linksys support site.

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    Mac OS version:
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    Kernel version:
    Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64
    Kernel UUID: DCF5C2D5-16AE-37F5-B2BE-ED127048DFF5
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    com.apple.driver.AppleUSBTCKeyboard 240.2
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    com.apple.driver.AppleAHCIPort 3.1.0
    com.apple.driver.AppleUSBEHCI 705.4.14
    com.apple.driver.AppleHPET 1.8
    com.apple.driver.AppleSmartBatteryManager 161.0.0
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    com.apple.driver.AppleAPIC 1.7
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    com.apple.nke.applicationfirewall 161
    com.apple.security.quarantine 3
    com.apple.security.TMSafetyNet 8
    com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
    com.apple.iokit.IOSerialFamily 11
    com.apple.AppleGraphicsDeviceControl 3.8.6
    com.apple.kext.triggers 1.0
    com.apple.driver.DspFuncLib 269.25
    com.apple.kext.OSvKernDSPLib 1.15
    com.apple.iokit.IOSurface 97
    com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.2f6
    com.apple.iokit.IOBluetoothFamily 4.3.2f6
    com.apple.nvidia.classic.NVDANV50HalTesla 10.0.0
    com.apple.nvidia.classic.NVDAResmanTesla 10.0.0
    com.apple.driver.IOPlatformPluginLegacy 1.0.0
    com.apple.driver.IOPlatformPluginFamily 5.8.1d38
    com.apple.iokit.IOUSBUserClient 705.4.0
    com.apple.iokit.IOFireWireIP 2.2.6
    com.apple.driver.AppleSMBusPCI 1.0.12d1
    com.apple.driver.AppleHDAController 269.25
    com.apple.iokit.IOHDAFamily 269.25
    com.apple.iokit.IOAudioFamily 203.3
    com.apple.vecLib.kext 1.2.0
    com.apple.driver.AppleGraphicsControl 3.8.6
    com.apple.driver.AppleBacklightExpert 1.1.0
    com.apple.driver.AppleSMBusController 1.0.13d1
    com.apple.iokit.IONDRVSupport 2.4.1
    com.apple.iokit.IOGraphicsFamily 2.4.1
    com.apple.driver.AppleSMC 3.1.9
    com.apple.driver.AppleUSBMultitouch 245.2
    com.apple.iokit.IOUSBHIDDriver 705.4.0
    com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.3
    com.apple.iokit.IOUSBMassStorageClass 3.7.1
    com.apple.driver.CoreStorage 471.10.6
    com.apple.driver.AppleUSBMergeNub 705.4.0
    com.apple.driver.AppleUSBComposite 705.4.9
    com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.3
    com.apple.iokit.IOBDStorageFamily 1.7
    com.apple.iokit.IODVDStorageFamily 1.7.1
    com.apple.iokit.IOCDStorageFamily 1.7.1
    com.apple.iokit.IOAHCISerialATAPI 2.6.1
    com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.3
    com.apple.iokit.IOEthernetAVBController 1.0.3b3
    com.apple.iokit.IO80211Family 710.55
    com.apple.driver.mDNSOffloadUserClient 1.0.1b8
    com.apple.iokit.IONetworkingFamily 3.2
    com.apple.iokit.IOFireWireFamily 4.5.6
    com.apple.iokit.IOAHCIFamily 2.7.5
    com.apple.iokit.IOUSBFamily 710.4.14
    com.apple.driver.AppleEFINVRAM 2.0
    com.apple.iokit.IOHIDFamily 2.0.0
    com.apple.driver.AppleEFIRuntime 2.0
    com.apple.iokit.IOSMBusFamily 1.1
    com.apple.security.sandbox 300.0
    com.apple.kext.AppleMatch 1.0.0d1
    com.apple.driver.AppleKeyStore 2
    com.apple.driver.AppleMobileFileIntegrity 1.0.5
    com.apple.driver.AppleCredentialManager 1.0
    com.apple.driver.DiskImages 396
    com.apple.iokit.IOStorageFamily 2.0
    com.apple.iokit.IOReportFamily 31
    com.apple.driver.AppleFDEKeyStore 28.30
    com.apple.driver.AppleACPIPlatform 3.1
    com.apple.iokit.IOPCIFamily 2.9
    com.apple.iokit.IOACPIFamily 1.4
    com.apple.kec.corecrypto 1.0
    com.apple.kec.Libm 1
    com.apple.kec.pthread 1
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    You have the MacBookPro6,2—the Edsel of Macs. It may have the logic-board defect that was covered by a recall program that has now ended.
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    Make a "Genius" appointment at an Apple Store, or go to another authorized service provider, to have the machine tested. The routine hardware diagnostics used by service providers do not detect the fault. There is a specific test for this issue that Apple calls "VST" (for "Video Switching Test.") Ask for it. A "Failed" result means that the fault is present.
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    Often the problems start after an OS upgrade. If the upgrade was recent, and you have backups, then you can revert to a previous OS X version.

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