Macbook won't wirelessly connect on login (only)

I have a MacBook with OS X 10.5 here, trying to connect to a WPA2 wireless network. The connection is set to automatic, and all username and password settings are correct, plus the security certificate is set to 'always accept', however on login the laptop fails to get assigned an IP address (no error messages or anything, just the wireless card does not connect to the network). If I turn the wireless card off and back on manually, however, it immediately (automatically) connects to the network and receives an IP address with no prompts or messages of any kind. Does anyone happen to know how to fix this behavior on login?
I should also probably note that this problem is specific to just one of dozens of laptops that all successfully automatically connect to the wireless network on login just fine.

Ok, I've been staring at the system.log file more, but I really can't make heads or tails of it. Here's what it looks like on startup and then login (auto-login is turned off):
Jul 7 12:56:59 MacBook-12710 com.apple.loginwindow[458]: System shutdown time has arrived^G^G
Jul 7 12:56:59 MacBook-12710 shutdown[15627]: SHUTDOWN_TIME: 1310068619 544999
Jul 7 12:56:59 MacBook-12710 com.apple.SystemStarter[20]: Stopping SymProtector
Jul 7 12:56:59 MacBook-12710 SystemStarter[20]: Symantec Directory Protector (15632) did not complete successfully
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: The following StartupItems failed to properly start:
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: /Library/StartupItems/NortonMissedTasks
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: - SystemStarter internal error
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: /Library/StartupItems/SymAutoProtect
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: - SystemStarter internal error
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: /Library/StartupItems/SymProtector
Jul 7 12:57:03 MacBook-12710 SystemStarter[20]: - execution of Startup script failed
Jul 7 12:57:28 localhost kernel[0]: npvhash=4095
Jul 7 12:57:26 localhost com.apple.launchctl.System[2]: /dev/disk0s2 on / (hfs, local, journaled)
Jul 7 12:57:27 localhost com.apple.launchctl.System[2]: launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
Jul 7 12:57:27 localhost com.apple.launchd[1] (com.apple.blued): Unknown key for boolean: EnableTransactions
Jul 7 12:57:27 localhost com.apple.launchd[1] (com.apple.RemoteDesktop.PrivilegeProxy): Unknown key for boolean: EnableTransactions
Jul 7 12:57:27 localhost com.apple.launchd[1] (com.apple.usbmuxd): Unknown key for boolean: EnableTransactions
Jul 7 12:57:27 localhost com.apple.launchd[1] (org.cups.cupsd): Unknown key: SHAuthorizationRight
Jul 7 12:57:27 localhost com.apple.launchd[1] (org.ntp.ntpd): Unknown key: SHAuthorizationRight
Jul 7 12:57:27 localhost com.apple.launchd[1] (org.x.privileged_startx): Unknown key for boolean: EnableTransactions
Jul 7 12:57:28 localhost kextd[12]: 430 cached, 0 uncached personalities to catalog
Jul 7 12:57:28 localhost kernel[0]: hi mem tramps at 0xffe00000
Jul 7 12:57:28 localhost kernel[0]: PAE enabled
Jul 7 12:57:28 localhost kernel[0]: 64 bit mode enabled
Jul 7 12:57:28 localhost kernel[0]: Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
Jul 7 12:57:28 localhost kernel[0]: standard timeslicing quantum is 10000 us
Jul 7 12:57:28 localhost kernel[0]: vm_page_bootstrap: 906107 free pages and 76933 wired pages
Jul 7 12:57:28 localhost kernel[0]: mig_table_max_displ = 79
Jul 7 12:57:28 localhost kernel[0]: 100 prelinked modules
Jul 7 12:57:28 localhost kernel[0]: AppleACPICPU: ProcessorApicId=0 LocalApicId=0 Enabled
Jul 7 12:57:28 localhost kernel[0]: AppleACPICPU: ProcessorApicId=1 LocalApicId=1 Enabled
Jul 7 12:57:28 localhost kernel[0]: Loading security extension com.apple.security.TMSafetyNet
Jul 7 12:57:28 localhost kernel[0]: calling mpo_policy_init for TMSafetyNet
Jul 7 12:57:28 localhost kernel[0]: Security policy loaded: Safety net for Time Machine (TMSafetyNet)
Jul 7 12:57:28 localhost kernel[0]: Loading security extension com.apple.nke.applicationfirewall
Jul 7 12:57:28 localhost kernel[0]: Loading security extension com.apple.security.seatbelt
Jul 7 12:57:28 localhost kernel[0]: calling mpo_policy_init for mb
Jul 7 12:57:28 localhost kernel[0]: Seatbelt MACF policy initialized
Jul 7 12:57:28 localhost kernel[0]: Security policy loaded: Seatbelt Policy (mb)
Jul 7 12:57:28 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
Jul 7 12:57:29 localhost kernel[0]: The Regents of the University of California. All rights reserved.
Jul 7 12:57:29 localhost kernel[0]: MAC Framework successfully initialized
Jul 7 12:57:29 localhost kernel[0]: using 16384 buffer headers and 4096 cluster IO buffer headers
Jul 7 12:57:29 localhost kernel[0]: IOAPIC: Version 0x11 Vectors 64:87
Jul 7 12:57:29 localhost kernel[0]: ACPI: System State [S0 S3 S4 S5] (S3)
Jul 7 12:57:29 localhost kernel[0]: mbinit: done
Jul 7 12:57:29 localhost kernel[0]: Security auditing service present
Jul 7 12:57:29 localhost kernel[0]: BSM auditing present
Jul 7 12:57:29 localhost kernel[0]: rooting via boot-uuid from /chosen: 32DAF22D-D3A2-3E61-B285-570DB66C6991
Jul 7 12:57:29 localhost kernel[0]: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Jul 7 12:57:29 localhost kernel[0]: wl0: Broadcom BCM432b 802.11 Wireless Controller
Jul 7 12:57:29 localhost kernel[0]: 5.10.91.21
Jul 7 12:57:29 localhost kernel[0]: Got boot device = IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@B/AppleMCP79AHCI/PR T0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageD river/TOSHIBA MK1653GSX Media/IOGUIDPartitionScheme/Customer@2
Jul 7 12:57:29 localhost kernel[0]: BSD root: disk0s2, major 14, minor 2
Jul 7 12:57:29 localhost kernel[0]: Jettisoning kernel linker.
Jul 7 12:57:29 localhost kernel[0]: Resetting IOCatalogue.
Jul 7 12:57:29 localhost kernel[0]: IGPU: family specific matching fails
Jul 7 12:57:29 localhost kernel[0]: Matching service count = 1
Jul 7 12:57:29 localhost kernel[0]: Matching service count = 2
Jul 7 12:57:29: --- last message repeated 4 times ---
Jul 7 12:57:29 localhost kernel[0]: Matching service count = 3
Jul 7 12:57:29 localhost kernel[0]: Previous Shutdown Cause: 5
Jul 7 12:57:29 localhost kernel[0]: NVDANV50HAL loaded and registered.
Jul 7 12:57:29 localhost kernel[0]: AppleIntelCPUPowerManagement: initialization complete
Jul 7 12:57:29 localhost kernel[0]: AppleTyMCEDriver::probe(MacBook5,1)
Jul 7 12:57:29 localhost kernel[0]: AppleTyMCEDriver::probe fails
Jul 7 12:57:29 localhost kernel[0]: IGPU: family specific matching fails
Jul 7 12:57:29: --- last message repeated 2 times ---
Jul 7 12:57:29 localhost kernel[0]: Matching service count = 0
Jul 7 12:57:30 localhost kernel[0]: [HCIController][configurePM] power parent ready after 1 tries
Jul 7 12:57:32 localhost rpc.statd[22]: statd.notify - no notifications needed
Jul 7 12:57:33 localhost bootlog[41]: BOOT_TIME: 1310068644 0
Jul 7 12:57:37 localhost kernel[0]: NVEthernet: Ethernet address 00:25:4b:ba:00:32
Jul 7 12:57:37 localhost fseventsd[32]: bumping event counter to: 0x3da0b8 (current 0x0) from log file '0000000000021c75'
Jul 7 12:57:37 localhost kernel[0]: AirPort_Brcm43xx: Ethernet address 00:25:00:47:71:8a
Jul 7 12:57:37 localhost DirectoryService[37]: Launched version 5.8.1 (v514.28)
Jul 7 12:57:37 localhost /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[28]: Login Window Application Started -- Threaded auth
Jul 7 12:57:37 localhost blued[50]: Apple Bluetooth daemon started.
Jul 7 12:57:38 localhost mDNSResponder mDNSResponder-176.3 (Oct 16 2008 04:25:18)[27]: starting
Jul 7 12:57:38 localhost com.apple.usbmuxd[18]: usbmuxd-211 built on Feb 8 2011 at 13:49:42 on Feb 8 2011 at 13:49:42, running 32 bit
Jul 7 12:57:39 localhost kernel[0]: NVEthernet::setLinkStatus - Valid but not Active
Jul 7 12:57:39 localhost kernel[0]: NVEthernet::mediaChanged - Link is down
Jul 7 12:57:39 localhost kernel[0]: NVEthernet::setLinkStatus - Valid but not Active
Jul 7 12:57:39 localhost kernel[0]: AirPort: Link Down on en1
Jul 7 12:57:39 MacBook-12710 configd[39]: setting hostname to "MacBook-12710.local"
Jul 7 12:57:40 MacBook-12710 /usr/sbin/ocspd[66]: starting
Jul 7 12:57:44 MacBook-12710 org.ntp.ntpd[16]: Error : nodename nor servname provided, or not known
Jul 7 12:57:44 MacBook-12710 ntpdate[74]: can't find host time.apple.com
Jul 7 12:57:44 MacBook-12710 ntpdate[74]: no servers can be used, exiting
Jul 7 12:57:46 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 12:57:46 MacBook-12710 kernel[0]: AirPort: Link Up on en1
Jul 7 12:57:46 MacBook-12710 kextd[12]: writing kernel link data to /var/run/mach.sym
Jul 7 12:57:46 MacBook-12710 com.apple.SystemStarter[20]: Starting SymProtector
Jul 7 12:57:49 MacBook-12710 ResponseHardwareService[82]: 3891612: (connectAndCheck) Untrusted apps are not allowed to connect to or launch Window Server before login.
Jul 7 12:57:49 MacBook-12710 com.apple.SystemStarter[20]: Thu Jul 7 12:57:49 MacBook-12710.local ResponseHardwareService[82] <Warning>: 3891612: (connectAndCheck) Untrusted apps are not allowed to connect to or launch Window Server before login.
Jul 7 12:57:49 MacBook-12710 /Applications/SMART Response/ResponseHardwareService.app/Contents/MacOS/ResponseHardwareService[82] : _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
Jul 7 12:57:49 MacBook-12710 com.apple.SystemStarter[20]: _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
Jul 7 12:57:50 MacBook-12710 loginwindow[28]: Login Window Started Security Agent
Jul 7 12:57:52 MacBook-12710 mdworker[67]: CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
Jul 7 12:57:53 MacBook-12710 mdworker[100]: CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
Jul 7 12:58:23 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 12:58:36 MacBook-12710 authorizationhost[98]: MechanismInvoke 0x127450 retainCount 2
Jul 7 12:58:36 MacBook-12710 SecurityAgent[99]: MechanismInvoke 0x101660 retainCount 1
Jul 7 12:58:36 MacBook-12710 SecurityAgent[99]: NSSecureTextFieldCell detected a field editor ((null)) that is not a NSTextView subclass designed to work with the cell. Ignoring...
Jul 7 12:58:36 MacBook-12710 SecurityAgent[99]: MechanismDestroy 0x101660 retainCount 1
Jul 7 12:58:36 MacBook-12710 authorizationhost[98]: MechanismDestroy 0x127450 retainCount 2
Jul 7 12:58:36 MacBook-12710 loginwindow[28]: Login Window - Returned from Security Agent
Jul 7 12:58:36 MacBook-12710 loginwindow[28]: USER_PROCESS: 28 console
Jul 7 12:58:36 MacBook-12710 com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[93]): Exited: Terminated
Jul 7 12:58:36 MacBook-12710 com.apple.launchd[106] (com.apple.AirPortBaseStationAgent): Unknown key for boolean: EnableTransactions
Jul 7 12:58:36 MacBook-12710 com.apple.launchd[106] (org.x.startx): Unknown key for boolean: EnableTransactions
Jul 7 12:58:43 MacBook-12710 /System/Library/CoreServices/coreservicesd[51]: SFLSharePointsEntry::CreateDSRecord: dsCreateRecordAndOpen(Administrator's Public Folder) returned -14135
Jul 7 12:58:43 MacBook-12710 /System/Library/CoreServices/coreservicesd[51]: SFLSharePointsEntry::CreateDSRecord: dsCreateRecordAndOpen(Shelley Smolnisky's Public Folder) returned -14135
Jul 7 12:58:47 MacBook-12710 mdworker[67]: CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
Jul 7 12:58:50 MacBook-12710 com.apple.usbmuxd[18]: HandleUSBMuxDictionary client 0x20e3d0-iTunesHelper/com.apple.iTunesHelper using library usbmuxd-211 built on Jan 13 2011 at 04:19:31, running usbmuxd-211 built on Feb 8 2011 at 13:49:42
Jul 7 12:58:53 MacBook-12710 /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer[1 23]: CPSGetProcessInfo(): This call is deprecated and should not be called anymore.
Jul 7 12:58:53 MacBook-12710 /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer[1 23]: CPSPBGetProcessInfo(): This call is deprecated and should not be called anymore.
Jul 7 12:58:58 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 12:59:15 MacBook-12710 /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[124]: CPSGetProcessInfo(): This call is deprecated and should not be called anymore.
Jul 7 12:59:15 MacBook-12710 /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[124]: CPSPBGetProcessInfo(): This call is deprecated and should not be called anymore.
Jul 7 12:59:36 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:00:09 MacBook-12710 loginwindow[28]: Unable to resolve startup item: status = -35, theURL == NULL = 1
Jul 7 13:00:10 MacBook-12710 SmileboxTray[233]: 2011-07-07 13:00:10 Starting tray...
Jul 7 13:00:11 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:00:12 MacBook-12710 mdworker[67]: CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
Jul 7 13:00:23 MacBook-12710 My Day[234]: .sdef error: Operation could not be completed. (NSXMLParserErrorDomain error 1549.)
Jul 7 13:00:23 MacBook-12710 My Day[234]: line number: 2
Jul 7 13:00:23 MacBook-12710 My Day[234]: .sdef error: Operation could not be completed. (NSXMLParserErrorDomain error 1549.)
Jul 7 13:00:23 MacBook-12710 My Day[234]: line number: 2
Jul 7 13:00:47 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:01:23 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:01:58 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:02:34 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:03:09 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:03:45 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:04:20 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:04:56 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:05:32 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:06:07 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:06:43 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Note: at this point, the airport menu is solid, claiming that we are connected to the WPA2 network. However an IP address has not been assigned, and the Network control panel reports 'Self Assigned IP Address'.
Here is the next part of the log, after I turn off the wireless card and turn it back on:
Jul 7 13:07:06 MacBook-12710 kernel[0]: AirPort: Link Down on en1
Jul 7 13:07:06 MacBook-12710 airportd[648]: AirPort off, bailing - GetPower() = off (0)
Jul 7 13:07:07 MacBook-12710 mdworker[677]: CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/4 to 224.0.0.251:5353 skt 7 error -1 errno 50 (Network is down) 933024856
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 933024856
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/4 to 224.0.0.251:5353 skt 7 error -1 errno 50 (Network is down) 933025099
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 933025099
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/4 to 224.0.0.251:5353 skt 7 error -1 errno 50 (Network is down) 933025349
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 933025349
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/4 to 224.0.0.251:5353 skt 7 error -1 errno 50 (Network is down) 933025599
Jul 7 13:07:08 MacBook-12710 mDNSResponder[27]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00815600   en1/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 933025599
Jul 7 13:07:09 MacBook-12710 airportd[648]: Error: Apple80211Scan() error 16
Jul 7 13:07:09 MacBook-12710 airportd[648]: Error: __performScan() EBUSY, try again in a sec
Jul 7 13:07:10 MacBook-12710 airportd[648]: Error: Apple80211Scan() error 16
Jul 7 13:07:10 MacBook-12710 airportd[648]: Error: __performScan() EBUSY, try again in a sec
Jul 7 13:07:11 MacBook-12710 airportd[648]: Error: Apple80211Scan() error 16
Jul 7 13:07:11 MacBook-12710 airportd[648]: Error: __performScan() EBUSY, try again in a sec
Jul 7 13:07:12 MacBook-12710 kernel[0]: Auth result for: 00:1e:4a:90:53:80 MAC AUTH succeeded
Jul 7 13:07:12 MacBook-12710 kernel[0]: AirPort: Link Up on en1
Jul 7 13:07:13 MacBook-12710 eapolclient[686]: en1 START
Jul 7 13:07:13 MacBook-12710 /usr/sbin/ocspd[688]: starting
Jul 7 13:07:14 MacBook-12710 eapolclient[686]: eapmschapv2_success_request: successfully authenticated
Jul 7 13:07:18 MacBook-12710 SmileboxTray[233]: NSScanner: nil string argument
Jul 7 13:07:18 MacBook-12710 SmileboxTray[233]: NSScanner: nil string argument
Jul 7 13:07:52 MacBook-12710 kernel[0]: en1: 802.11d country code set to 'US'.
Jul 7 13:07:52 MacBook-12710 kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 5 6 7 8 9 10 11 1 2 3 4 5 6 7 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165 40 48 56 64 104 112 120 128 136 153 161 36 4452 60
Any guesses as to why the 'Link Up on en1" and subsequent steps aren't happening at login?

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Are you getting full signal?
Is the wireless router or access point around anything with a lot of metal or..
since you said that when you connect to your modem via ethernet then you could have a problem with your wireless infrastructure... if you have tested your wireless network with another computer and it works fine or if you went somewhere that has a hot spot then you can determine if there is an issue with your home network or an issue with the wireless card in the laptop...

Macbook won't boot up - grey screen only

Hi,
I have a core duo MacBook from summer 2007.
All of a sudden the MacBook won't boot up. The battery is fully charged and AC adapter plugged in (same symptoms if not plugged in). The following occurs upon pressing the power button:
1) Start-up chime sounds
2) Can hear hard drive and fans start up
3) Screen turns grey
4) Nothing happens (screen still grey)
Thoughts? I tried resetting PRAM and PMU with no changes.

I have the same problem, just the grey screen and tried
- resetting PRAM (second chime, so this should be OK)
- Safe Mode (just the same)
and pressing Option (or C) to choose the Mac OS X Install Disc gives me the wonderful cursor which can be moved by moving the mouse. No harddisk and even no Install DVD are displayed on the screen.
Also The Apple Hardware Test (by pressing D) doesn't get further than the, now familiar, grey screen.
I pressed the keys with different keyboards, with the original white keyboard and with the aluminium keyboard.
As I've tried everything, I think there's something seriously wrong. Does anybody have some last tips that I can try?

Apple MacBook Pro dropping wireless connection

Hi,
We have many MacBook pros that are having a hard time staying connected on wireless. Often times a user can be connected for only minutes at a time. Our wireless environment consists of 1142s and 3502 series access points. We use WPA2 Enterprise for authentication via ACS server 5.x.
The Windows 7 machines usually never have an issue. Can someone please provide some insight.?
*we use Lion OSX on our Macs.
This Discussion has been converted into a Document:- https://supportforums.cisco.com/docs/DOC-26228

Consol, telnet or ssh to the WLC and enter this command:
config advanced eap ?
bcast-key-interval Configures EAP-broadcast key renew interval time in seconds.
eapol-key-retries Configures EAPOL-Key Max Retries.
eapol-key-timeout Configures EAPOL-Key Timeout in milliseconds.
identity-request-retries Configures EAP-Identity-Request Max Retries.
identity-request-timeout Configures EAP-Identity-Request Timeout in seconds.
key-index Configure the key index used for dynamic WEP (802.1x) unicast key (PTK).
max-login-ignore-identity-response Configure to ignore the same username count reaching max in the EAP identity response
request-retries Configures EAP-Request Max Retries.
request-timeout Configures EAP-Request Timeout in seconds.
Might of sent the wrong link:
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a0080665d18.shtml#Tshoottips

Lexar USB plugged into Macbook Pro stops wireless connection from working

Just purchased a Macbook Pro recently. Noticed today that when a USB stick was plugged in (Lexar 32 GB USB 3.0) was plugged in, the wireless networking could not connect to any network services.
Finder kept trying to get to the network storage and failing or timing out. Time Machine failed to reach the server.
Unplugging the USB stick fixed the problem.
Anyone seen this before?
Chris

Thanks again for your help Rod!
One of the first things I tried was different combinations of devices to see if it may have been the device just not powering up. The main device I use is an official Apple wired keyboard, because at home I connect my MBP to my monitor and use a separate keyboard and mouse. I have tried other devices too with the same result, they only work when the dock is connected. I have tried connecting my iPhone via USB cable, i have a 16GB SanDisk Cruzer flash drive, which only lights up if the dock is connected, and I have a 4 port USB hub with a power LED on it, which again only lights up when the dock is connected.
I looked in system profiler, and it says the USB ports are there, but doesn't recognise any devices plugged in, other than the dock. However, when the dock is plugged in, for example, it recognises the Apple keyboard in the other port.
I took two screen shots, one of system profiler without the dock plugged in (USB keyboard still plugged in but not showing up), and another of when I plugged the dock in.
Without Dock:
With Dock:
It might be worth pointing out that the HDD dock has two USB ports on it, which is what is highlighted in the second pic.
I have also tried rebooting the computer with devices already attached but with the same result again. I've tried booting it with the dock and the keyboard attached, with just the keyboard, with just the dock, but either way unless the dock is connected, nothing else will work via USB.
I just want to say thanks again Rod, it's very kind of you to spend your time trying to help me, and it is really appreciated!
I'm going to contact Apple support shortly and see if they can offer a solution, or see if I can send it in for repair, which I am reluctant to do seeing as it's my only computer
Cheers!
Gav

MacBook Won't Stay Connected to Smart Phone WiFi

Mac OS X version 10.7.5 running on 2 year old macbook pro 2 GHz Intel i7 8 GB memory.
This has been a consistent problem ever since I've owned this MacBook...just that I'm online trying to pay bills tonight and do some business and have had to reconnect every 2 minutes and it's driving me slightly insane.
So here's the deal. On my Verizon smart phones (used to be a Droid, now is a Windows HTC...the phone doesn't seem to matter) I've got the mobile hot spot. I turn it on, it shares the phone's internet connection over a wifi signal. I turn on the sharing on the phone, wait for it to appear in the wifi connection dialog on my mac and then connect. It takes a second and then I'm connected. I go to my favorite banking site, enter my username and password, wait and wait, then look up at the toolbar and notice that I'm not connected wifi anymore. I reconnect to the phone, refresh the website, enter my name and password, login, then start to pay bills and it starts hanging again. I look up at the toolbar, I'm not connected again. I reconnect again, am able to continue working online for a couple of minutes and then it disconnects again. It will do this sometimes two or three times, sometimes five or six times. Eventually it stops disconnecting and I am able to continue working normally for as long as I like.
Now, the mac does not have this problem with any other wifi. If I'm at home connected to my home network, it connects just fine. Starbucks...connects just fine.
Also, none of my other devices have any problem connecting to the phone. My Nexus 7 tablet connects to the phone just fine. My other laptop connects to the phone just fine and there's none of this constant disconnecting.
And right now as I'm looking up at the toolbar I see it's disconnected again.
Why does my MacBook Pro keep disconnecting from my phone's hot spot? How can I diagnose and hopefully fix this problem?
Thanks,
Jeff

I'm having this issue, as well. I have 2 MacBooks and they both lose WiFi after waking-up from sleep. Ever since Lion came to town, this has taken a poop in the connectivity bed.
I state a preferred network, yet after waking up it is no longer connected or grabs some random network. I've tried to tell it only preferred, but it keeps doing its own thing.
VERY ANNOYING.... especially when they fixed the iMac for the issue I am describing. Ughhh.

How can I fix my MacBook Pro losing wireless connectivity with Epson Stylus NX625 printer. It will work once and then I get an error saying the printer is not connected.

I can connect to my Epson Stylus NX625 through my wireless network and print a page or two, but then the next time I go to print it says that the printer is not connected. Any fixes? I have tried deleting the printer and re-adding it to my MacBook Pro OS X version 10.9.4, but sometimes it doesn't even find it, and other times it says it is connected, but when I go to print it says not connected. Very frustrated. I have also installed the latest drivers, etc.
What now?

Your computer is going to run hot while playing CPU/GPU intensive games - it should heat up and the fans should be noticably loud. As to why it's 'crashing' - can you post a kernel panic log? You may have some third-party kexts that are causing the problems.
Clinton

Please Help, My macbook won't stay connected to internet idk what to do

Hello, i just bought my macbook pro. Its a Mac OS X ver. 10.5.7 with a 2.26GHz processor.
I have a Netgear 54mbps wireless router WGR614 v8 and a Motorola SB5100 SURFboard Cable modem.
Now the problem im having is with the internet connection with my mac. I live in Virginia and It was working before i went on vacation to tennessee which is an hour behind virginia. It was able to connect with no problems. It was also connecting fine in tennessee as well. But when i came back to Virginia, the mac would connect to my router or atleast say its connected but i can't use the internet at all. I would load either firefox, safari, or itunes store and the page would begin to load and then stop loading in the middle. As if it was freezing, dropping the connection or something. When i look through the airport connectivity, it would stay connected to my router with still no access to the internet. I also checked to make sure i was in the correct time zone with my mac and it was correct.I have a wii, xbox, original pc that are connected to router that operate perfectly. its just my macbook wont connect wirelessly when it used to before i went to tennesse and took it with me. Some of the error messages that i get when i try to use the internet via macbook now are "can't open page because the server unexpectedly dropped the connection" but then minutes later it would connect again, then internet would work. But shortly after it would stop working for a while. and the process continues like a cycle. PLEASE HELP BECAUSE IM CLUELESS. i've looked at many forums but no solution.

I've been having the same problem for the last 2 weeks, because it's a macbook air it's completely useless!
I spent a tenner on a usb/ethernet cable but it's not Mac Compatable, to buy an official one is going to cost ...god knows. But this machine comes with no superdrive, no ethernet, no adapter for an ethernet. The least they can do is make sure the wifi works! I think I upgraded the OS, but I can't be sure if that coincided with the crap internet speeds.
I'm really angry now, I don't have the time to take it down to shop, and looking on the internet it appears this is really common problem. It's a beautiful machine, but if I knew it was going to be this much hassle I wouldn't have bothered. This is the first and last time I will buy a mac.

Airport fails to connect at login (only)

Using a MacBook with OSX 10.5, I am trying to connect to a WPA2 Enterprise network. All of the settings are correct, and the certificate is set on 'always trust'.. but on startup/login, Airport fails to connect (no error message, but IP address is self-assigned). If I turn airport off and back on, it properly connects instantly, with no prompts at all.
Does anyone know a reason why the machine would be unable to automatically connect to the network at login, but able to just fine if I manually turn the airport off and back on?

Hmm.. in retrospect this probably isn't the right sub-forum for this question.. it should maybe go in a sub-forum for OS X 10.5 instead (it's not related to the airport basestation). Please feel free to move this, if so.

MacBook Pro's wireless connectivity with ZTE 531 ADSL modem using BSNL broadband

I have tried to connect macbook pro with BSNL broadband internet connection using ZTE 531 ADSL modem. The connection using both wireless mode and ethernet mode failed repeatedly. Using the same modem, I am able to connect to internet through my Sony Viao running Windows 8 and HP630 running ubuntu (both in wireless mode and ethernet mode). I have tried the 'assist me->diagnostics' option in Macbook's network diagnostics. The first 4 indicators are green, but the remaining 2 (ISP and server) remains yellow. Repeated attempts were made by restarting the modem.
Surprisingly, the Macbook works fine with a newly purchased Dlink N150 ADSL2 modem. I have used the same WIFI settings ( as in the ZTE modem) in Dlink modem also. What could be the reason for this ?

Hello jayan_a_r,
From what you are talking about, it seems like you have done some good troubleshooting to attempt to sort it out. Try using a different Network Location as sometimes that could be an issue when trying to access the internet. Also make sure that modem is using the recommended settings for the wireless access.
Using network locations (Mac OS X v10.6 and later)
http://support.apple.com/en-us/HT5289
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/en-us/HT4199
Regards,
-Norm G.

Macbook won't wirelessly connect on login (only)

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