Macbook Pro Problems with D-Link Router

My router D-link (Dl-624+A, model available in Asia) 802.11g/2.4 Ghz wireless router serves a G5 iMac, a G4 Aluminum Powerbook plus a Windows laptop and desktop. We have never experienced any problems with the network.
I have recently bought a 17" Macbook Pro 2.4 Ghz laptop (intel MBP) and have not been able, in any combination of modes, to join the network. A dialogue box simply says that there was an error trying to join the network.
I have no problems joining other wireless networks around town its so easy, just the one at home is the problem.
What is going on? Is there a fix? Thanks

Hi, my MacBook Pro can't connect to my D-Link DSL-G604T router via wireless too.
Airport can see my wireless connection and asks for the WEP password to connect. I put the password key in and an error pops up saying it cannot connect. I can connect via an Ethernet cable. Also, my previous system PowerBook G4 is able to connect via to the router via wireless, hence there is nothing wrong with my network.
Based on the suggestions from other threads, I tried to set my security to WPA instead of WEP. However, after I set my security to WPA, and tried to connect to my wireless network, the AirPort popup only gives me 4 options for the Wireless Security:
WEP Password
WEP 40/128-bit hex
WEP 40/128-bit ASCII
LEAP
There isn't an option to use WPA. Can anyone advise?

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Guidelines on connecting a MacBook Pro to a TP-Link router? All other devices connect except this.

Hi
I've set up a new TP-Link router and range extender. I can connect with all of my other devices but not my MacBook Pro, which is the main device I like to use in the house. Can anyone give me guidelines please? There seems to be a problem with the IP. The TP guidelines advise to set automatically but this doesn't seem to be an option. It's so frustrating! I've gone back to my old Belkin but it seems such a waste as I can't get a refund on the new products.
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The iMac connects to the router AP with no problem, but not the nano router when it is set to AP.
I can't figure out what this means.

MacBook Pro Problem withe restart

i buy this mac from my Friend Still withe Good condition
15-inch, Early 2011
Processor 2 GHz Intel Core i7
Memory 4 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6490M 256 MB
Software OS X 10.9.5 (13F34) Before i was Use Yosemite 10.10.2 Same problem And More
i have many problems latle I trie so hard to fix but can't My problem withe ( restart ) the Pc Sadly restart i do down below
1- Restart the Nvram ( command + option + p + r ) many time Nothing change
2- hold down power button mac 15 Second ) Nothing Change
3-Open Disk utility when the mac open and repair + repair permissions ) The result No errors
4-Open Disk utility under the Booting withe command + r) I Do The. repair + repair permissions ) The result No errors
5- Open Diskdisk utility under the Booting withe command + Option + r) I Do The. repair + repair permissions ) The result No errors
6- I Delete the hard and make it ( GUID ) and re install 1 time from Cd 1 time From flash + 3 Time from Internet !!! Same Still Restart !
7- I Delete also the hard and And Clean It All withe 0GB And do the Same the procedure ) Same result !
8- I Take the Laptop to Apple Store In Jakarta ( Ratu Plaza mall ) the said you want to restart to ears All and download Again and the don't i do it 100 time before so no hardware problem = nothing Change > same result
9- some one told me the new Yosemite ( 10.10.2 ) Its still Not staible So downgraid the PC To Yosemite ( 10.10 ) < also nothing change Still many thing if i want top open will restart Example the( Camfrog ) ( Maps ) some Time i just Pouch it will restart !!
10. i Try also to this Time downgraid to ( OS X 10.9.5 (13F34) ). same same same
and i do all what can i do
Note:
when I tray to open the System under Safe mode i can Open any thing withe out restart !!
and i try to instill Windows 8.1 there is nothing happend so Smooth and fast
please I ask For Help Because my circumstances are not good I do not have enough money to buy
the error this
Anonymous UUID:       BDAE5450-98B2-0CA3-B459-B40A82A5E592
Wed Feb 11 01:27:31 2015
panic(cpu 0 caller 0xffffff7fa972aeaa): "AGC GPU REGISTER RESTORE FAILED : rdar://7254528, VendorID invalid"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.6.22/src/Appl eMuxControl/kext/AGCPowerManagement.cpp:1114
Backtrace (CPU 0), Frame : Return Address
0xffffff80c2123de0 : 0xffffff8027a22f79
0xffffff80c2123e60 : 0xffffff7fa972aeaa
0xffffff80c2123ea0 : 0xffffff7fa972d650
0xffffff80c2123ec0 : 0xffffff8027eb359b
0xffffff80c2123f20 : 0xffffff8027a4a20a
0xffffff80c2123fb0 : 0xffffff8027ad7607
      Kernel Extensions in backtrace:
         com.apple.driver.AppleMuxControl(3.6.22)[32862231-50BC-3AF6-87A2-703321AE4F90]@ 0xffffff7fa971f000->0xffffff7fa9732fff
            dependency: com.apple.driver.AppleGraphicsControl(3.6.22)[AA46D551-BE0F-33DA-93A3-8F46197BB 36F]@0xffffff7fa9706000
            dependency: com.apple.iokit.IOACPIFamily(1.4)[045D5D6F-AD1E-36DB-A249-A346E2B48E54]@0xfffff f7fa832c000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[2852ACFE-FD28-3C37-9B39-885201BB8D25]@0xffffff 7fa80bf000
            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[75D81741-64C1-3941-ADFA-9D6B6C434EE4]@0 xffffff7fa88f1000
            dependency: com.apple.driver.AppleBacklightExpert(1.0.4)[80899285-3952-30DA-A0F9-357C51E104 CF]@0xffffff7fa971a000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
13F34
Kernel version:
Darwin Kernel Version 13.4.0: Sun Aug 17 19:50:11 PDT 2014; root:xnu-2422.115.4~1/RELEASE_X86_64
Kernel UUID: 9477416E-7BCA-3679-AF97-E1EAAD3DD5A0
Kernel slide:     0x0000000027800000
Kernel text base: 0xffffff8027a00000
System model name: MacBookPro8,2 (Mac-94245A3940C91C80)
System uptime in nanoseconds: 87384372209
last loaded kext at 42236080152: com.apple.filesystems.autofs 3.0 (addr 0xffffff7fa8f12000, size 45056)
loaded kexts:
com.apple.filesystems.autofs 3.0
com.apple.iokit.IOBluetoothSerialManager 4.2.7f3
com.apple.driver.AudioAUUC 1.60
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AppleTyMCEDriver 1.0.2d2
com.apple.driver.AGPM 100.14.34
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.ApplePolicyControl 3.6.22
com.apple.driver.AppleMikeyDriver 2.6.3f4
com.apple.driver.AppleHDAHardwareConfigDriver 2.6.3f4
com.apple.driver.AppleHDA 2.6.3f4
com.apple.driver.AppleUpstreamUserClient 3.5.13
com.apple.kext.AMDFramebuffer 1.2.4
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.AMDRadeonX3000 1.2.4
com.apple.iokit.IOBluetoothUSBDFU 4.2.7f3
com.apple.driver.AppleIntelHD3000Graphics 8.2.4
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.7f3
com.apple.driver.AppleBacklight 170.4.11
com.apple.kext.AMD6000Controller 1.2.4
com.apple.driver.AppleLPC 1.7.0
com.apple.driver.AppleMuxControl 3.6.22
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.driver.SMCMotionSensor 3.0.4d1
com.apple.driver.AppleMCCSControl 1.2.5
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleIntelSNBGraphicsFB 8.2.4
com.apple.driver.AppleSMCPDRC 1.0.0
com.apple.driver.AppleThunderboltIP 1.1.2
com.apple.driver.AppleUSBTCButtons 240.2
com.apple.driver.AppleUSBTCKeyEventDriver 240.2
com.apple.driver.AppleUSBTCKeyboard 240.2
com.apple.driver.AppleIRController 325.7
com.apple.driver.AppleFileSystemDriver 3.0.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.iokit.SCSITaskUserClient 3.6.7
com.apple.driver.XsanFilter 404
com.apple.driver.AppleUSBHub 683.4.0
com.apple.iokit.IOAHCIBlockStorage 2.6.0
com.apple.driver.AppleSDXC 1.5.2
com.apple.iokit.AppleBCM5701Ethernet 3.8.1b2
com.apple.driver.AirPort.Brcm4331 700.20.22
com.apple.driver.AppleFWOHCI 5.0.2
com.apple.driver.AppleAHCIPort 3.0.5
com.apple.driver.AppleUSBEHCI 660.4.0
com.apple.driver.AppleUSBUHCI 656.4.1
com.apple.driver.AppleSmartBatteryManager 161.0.0
com.apple.driver.AppleACPIButtons 2.0
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 2.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 217.92.1
com.apple.nke.applicationfirewall 153
com.apple.security.quarantine 3
com.apple.driver.AppleIntelCPUPowerManagement 217.92.1
com.apple.kext.triggers 1.0
com.apple.iokit.IOSerialFamily 10.0.7
com.apple.driver.DspFuncLib 2.6.3f4
com.apple.vecLib.kext 1.0.0
com.apple.iokit.IOAudioFamily 1.9.7fc2
com.apple.kext.OSvKernDSPLib 1.14
com.apple.iokit.IOAcceleratorFamily 98.23
com.apple.iokit.IOSurface 91.1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.7f3
com.apple.kext.AMDSupport 1.2.4
com.apple.AppleGraphicsDeviceControl 3.6.22
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.driver.AppleGraphicsControl 3.6.22
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.AppleSMBusController 1.0.12d1
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.iokit.IOBluetoothFamily 4.2.7f3
com.apple.driver.AppleSMC 3.1.8
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.driver.IOPlatformPluginFamily 5.7.1d6
com.apple.driver.AppleHDAController 2.6.3f4
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.iokit.IOHDAFamily 2.6.3f4
com.apple.driver.AppleThunderboltEDMSink 2.1.3
com.apple.driver.AppleThunderboltDPOutAdapter 3.1.7
com.apple.driver.AppleThunderboltDPInAdapter 3.1.7
com.apple.driver.AppleThunderboltDPAdapterFamily 3.1.7
com.apple.driver.AppleThunderboltPCIDownAdapter 1.4.5
com.apple.driver.AppleUSBMultitouch 240.10
com.apple.iokit.IOUSBHIDDriver 660.4.0
com.apple.driver.AppleUSBMergeNub 650.4.0
com.apple.driver.AppleUSBComposite 656.4.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.7
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.driver.AppleThunderboltNHI 2.0.1
com.apple.iokit.IOThunderboltFamily 3.3.1
com.apple.iokit.IOAHCISerialATAPI 2.6.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.7
com.apple.iokit.IOUSBUserClient 660.4.2
com.apple.iokit.IOEthernetAVBController 1.0.3b4
com.apple.driver.mDNSOffloadUserClient 1.0.1b5
com.apple.iokit.IO80211Family 640.36
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IOAHCIFamily 2.6.5
com.apple.iokit.IOUSBFamily 686.4.1
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 278.11.1
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 7
com.apple.driver.AppleKeyStore 2
com.apple.driver.DiskImages 371.1
com.apple.iokit.IOStorageFamily 1.9
com.apple.iokit.IOReportFamily 23
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 2.0
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0
com.apple.kec.pthread 1
Model: MacBookPro8,2, BootROM MBP81.0047.B27, 4 processors, Intel Core i7, 2 GHz, 4 GB, SMC 1.69f4
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 384 MB
Graphics: AMD Radeon HD 6490M, AMD Radeon HD 6490M, PCIe, 256 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.7f3 14616, 3 services, 15 devices, 0 incoming serial ports
Serial ATA Device: TOSHIBA MK5065GSXF, 500.11 GB
Serial ATA Device: HL-DT-ST DVDRW GS31N
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: BRCM2070 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Apple Internal Keyboard / Trackpad
USB Device: Hub
USB Device: IR Receiver
Thunderbolt Bus: MacBook Pro, Apple Inc., 22.1

Try running this program and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read.
Etrecheck – System Information

Macbook pro problem with spinning wheel

hello....i have a macbook pro 15" i7 and i have a problem with the spinning wheel of Mac os X. I am always seeing this spinning wheel. for example I open mail and safari at the same time and i get this spining wheel for 25 secondes...
any solutions????
please help me...

i open mail and then the activity and i saw that it was sending me password to find any new mails
Did it find any new mails? Or did it just sit there asking for a password?
then how can i see that my home page is set to one that fully loads accurately in my browser???
Find a website you like to visit that doesn't have problems loading. Google and Wikipedia and Apple's own website all should always work.
Go to Safari menu -> Preferences -> Click on the light switch for General.
There you will find a home page field where you can put that website you like.

Macbook Pro problem with chip on motherboard

After 3 year working macbook pro begin to lag instantly without any reason. In the service master sad that the problem is connected with some chip on motherboard that couldn't be repaired.
Did somebody face the problem? What possible solution?

Take it to an Apple store or AASP. Forget about the service master.

MacBook Pro Problem with screws I think

So I recently saw my MacBook Pro casing lifting up and when I lifted up to look inside I saw the screw is attached to nothing. So I went on google and looked up the shell and there should be a slot where the screw on the left hand side screws into. I'm taking my Mac into a Apple Authorized Reseller to put a 500GB HDD and might ask them to fix it. Will they charge me as they charged me bloody 800 Bucks to replace a monitor and getting the hard drive done will cost around €260. So do you think they will fix it for free? Here are some pictures. Also I have Apple Care
[IMG]http://i40.tinypic.com/2hy9aj8.jpg[/IMG]
[IMG]http://i39.tinypic.com/le14x.jpg[/IMG]

GeekOfComedy:
Hope Apple gets it sorted out for you. Having computer problems (sort of like having car problems on a long road trip) is not much fun and very frustrating.
Thanks for leaving feedback in Apple Discussions by marking the "solved" post.
cornelius

MacBook Pro; problem with charge

My 2011 MacBook Pro was charging all night, but won't go above an hour and a half on the battery without it being plugged in. Even having it plugged in for an hour when it dropped to an hour left only brought it back up to an hour. It keeps saying calculating and then 1:30 and the time keeps dropping, even with Wi-Fi off, screen brightness down all of the way, and nothing opened. Usually when I take it to class with me it has a GOOD four hours (if not more) on the charge. Do I let it die and then fully recharge it when I get home from class?
Any help, advice, or past experience you would like to share I would greatly appreciate.
Thank you!

Hold the option key down and click the battery icon in the menu bar.
Does it say condition: Normal?
Do not let the battery run down.
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
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MacBook Pro Problem with Final Cut Studio

For some reason Final Cut Studio will not run on my MacBook Pro 2.33GHz Intel Core 2 Duo. It loads then disappear. The only version that worked was 5.0 but felt very slow so im thinking it was using rosetta. After reinstalling OSX hoping that would help. Still that didnt help. I installed 5.1 then used Apple Software Update to download all the update. All update was install but still nothing works. Well if this post seems similiar to someone else post please point me to the right place. any answer will help thanks. I've read the support CPU but didnt see any information on whether it support the Core 2 Duo.

no reason it shouldn't work, and work very well at that.
do none of the FCS apps work, or is it just FCP?
if you have just finished a full reinstall, then for good measure you should run Repair Permissions from /Applications/Utilities/Dissk Utility
it may also be that the preference files are corrupted (try FCP Rescue http://fcprescue.andersholck.com/ )
also try the prebinding thing ... see this post by Brian Conner http://discussions.apple.com/thread.jspa?messageID=3961108&#3961108 or the apple technote http://docs.info.apple.com/article.html?artnum=93984
cheers
Andy

MacBook Pro problem with iPhone personal hotspot connection

I think there is a problem with my airport, I can't connect to any iPhone personal hotspots anymore - I used to be able to connect to them, and now it connects but with an exclamation mark saying there is no internet connection? Any help would be great!

Apple doesn't participate here. If you want to give them feedback, use the Feedback page:
http://www.apple.com/feedback

I have a Macbook pro 2009 with Snow Leopard. Which system can I install without running into complicated problems which I will not be able to solveby myself? (Mountain Lion, Mavericks, Yosemite?)

I have a Macbook pro 2009 with Snow Leopard. Which system can I install without running into complicated problems which I will not be able to solve by myself- a person with limited problem solving abilities. (Mountain Lion, Mavericks, Yosemite?)

It will make it easier to help you w/ your problem to know the size and RAM installed.
"Yesterday I couldn't update the maps on my Garmin because it said the OS I had wouldn't work"
What OS will your Garmin work with? Funny there was someone else that did that and upgraded to Yosemite and regretted it.
I'd say Lion if your Garmin is compatible.
Both Lion and Mountain Lion are downloadable from the Apple Store:
http://store.apple.com/us/product/D6106Z/A/os-x-lion
http://store.apple.com/us/product/D6377Z/A/os-x-mountain-lion
The OSs will get more resource hungry the higher you go.

Problem install windows on mid 2010 MacBook Pro 13 with 10.9.1

I run into problem install windows on mid 2010 MacBook Pro 13 with 10.9.1. Boot Camp Assistant shows error "Can't install the software because it is not currently available from the Software Update server.". So what is the problem and how can I work around it? I also tried to only chose "Install Windows 7" option, but it could not recognize my windows dvd (which I created from ISO). Any help is appreciated.

I run into problem install windows on mid 2010 MacBook Pro 13 with 10.9.1. Boot Camp Assistant shows error "Can't install the software because it is not currently available from the Software Update server.". So what is the problem and how can I work around it? I also tried to only chose "Install Windows 7" option, but it could not recognize my windows dvd (which I created from ISO). Any help is appreciated.

Problems with Dinamic Link between Premiere pro CC and After Effects CC

I'm having serious problems with dinamic link between premiere pro and after effects, really serious problems that have 2 big projects in trouble (a documentary and a video clip) and I had to redo all the work pipeline to the consumer.
The documentary for a spanish TV was made on CC 2014 and a video clip was made on CC. Both of them with a lot of after effects composition in the premiere pro timeline. Render freeze, a lot of playback issues, and many more problems... Until I decided to remove these links between premiere and after effects and render out all the after effects compositions one by one and insert as clips in premiere pro. 1 week working away with back and fourth.
I've got a huge workstation:
i7 4990
32Gb ram
GTX780 3gb
256 gb system ssd
2 Tb project storage
*All my hardware and software are update.
I know that a lot of folks are on the same huge problem and I want to ask everyone:
How do you save this?
What is your pipeline?
Are there any solution?
Best practice to use dinamic link in a huge project?
Thanks,
Ruben Gimenez.
R&D iceblink.es
www.rambot.es

Thank You, Jim -
Unfortunately that specifically did not work.
Based on another comment sent to me, here is what did.
In PProCC
File > Adobe Dynamic Link > New After Effects Composition
In AECC
From that composition created from PPro, I imported the project (aep) initially created in AECC from another team member. Saved the file.
Back in PProCC
File > Adobe Dynamic Link > Import After Effects Composition
Magic.

Hey guys, This is the problem. My father just got an iPhone 5. He has a Macbook Pro 2009 with OS X 10.5.8. The iPhone is not compatible with this version since the iTunes is an older version as well. At our local Apple store in my home country, they told

Hey guys,
This is the problem. My father just got an iPhone 5. He has a Macbook Pro 2009 with OS X 10.5.8. The iPhone is not compatible with this version since the iTunes is an older version as well. At our local Apple store in my home country, they told him he needs to upgrade (which I agree of) but that the memory of this computer is not enough to hold the newer OS.
Please help, he does not really agree with buying a new computer just because of the versions.
Thank you, I appreciate your help.

This is what I have. Thank you so much rdr4lfe.

BlueTooth [BT] failed during use. Various links say "BT Not Available" - "No BT Hardware Found" etc. Have 3 yr. MacBook Pro Notebook with OSX 10.6.8 with built-in Bluetooth. HELP !

Bluetooth [BT] failed during use.Menu bar icon remains as does two BT icons in Utilities folder. System Prefs. BT icon totally gone. Remaining icons say "No BT Hardware Found" - " BT Not Available" etc. Have 3 yr. old MacBook Pro Notebook with OSX 10.6.8 & built-in Bluetooth. [ Close by iPad's BT remains functional. ]

Yeah the Bluetooth hardware has failed and needs to be replaced. there is nothing you can do except replace the BT chip. Take it to Apple.

Does my macbook pro come with anti virus protection?

Does my Macbook Pro come with anti-virus protection, or do i need to supply it myself?

Mac users often ask whether they should install "anti-virus" software. The answer usually given on ASC is "no." The answer is right, but it may give the wrong impression that there is no threat from what are loosely called "viruses." There is a threat, and you need to educate yourself about it.
1. This is a comment on what you should—and should not—do to protect yourself from malicious software ("malware") that circulates on the Internet and gets onto a computer as an unintended consequence of the user's actions. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the computer, or who has been able to take control of it remotely. That threat is in a different category, and there's no easy way to defend against it.
The comment is long because the issue is complex. The key points are in sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user. Internally Apple calls it "XProtect."
The malware recognition database used by XProtect is automatically updated; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
☞ It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
☞ It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
☞ It can easily be disabled or overridden by the user.
☞ A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
☞ An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
Apple has so far failed to revoke the codesigning certificates of some known abusers, thereby diluting the value of Gatekeeper and the Developer ID program. These failures don't involve App Store products, however.
For the reasons given, App Store products, and—to a lesser extent—other applications recognized by Gatekeeper as signed, are safer than others, but they can't be considered absolutely safe. "Sandboxed" applications may prompt for access to private data, such as your contacts, or for access to the network. Think before granting that access. Sandbox security is based on user input. Never click through any request for authorization without thinking.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is effective against known threats, but not against unknown ones. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. The built-in security features of OS X reduce the risk of malware attack, but they are not, and never will be, complete protection. Malware is a problem of human behavior, not machine behavior, and no technological fix alone is going to solve it. Trusting software to protect you will only make you more vulnerable.
The best defense is always going to be your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "Trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and Internet criminals. If you're better informed than they think you are, you'll win. That means, in practice, that you always stay within a safe harbor of computing practices. How do you know when you're leaving the safe harbor? Below are some warning signs of danger.
Software from an untrustworthy source
☞ Software with a corporate brand, such as Adobe Flash Player, doesn't come directly from the developer’s website. Do not trust an alert from any website to update Flash, or your browser, or any other software. A genuine alert that Flash is outdated and blocked is shown on this support page. Follow the instructions on the support page in that case. Otherwise, assume that the alert is fake and someone is trying to scam you into installing malware. If you see such alerts on more than one website, ask for instructions.
☞ Software of any kind is distributed via BitTorrent, or Usenet, or on a website that also distributes pirated music or movies.
☞ Rogue websites such as Softonic, Soft32, and CNET Download distribute free applications that have been packaged in a superfluous "installer."
☞ The software is advertised by means of spam or intrusive web ads. Any ad, on any site, that includes a direct link to a download should be ignored.
Software that is plainly illegal or does something illegal
☞ High-priced commercial software such as Photoshop is "cracked" or "free."
☞ An application helps you to infringe copyright, for instance by circumventing the copy protection on commercial software, or saving streamed media for reuse without permission. All "YouTube downloaders" are in this category, though not all are necessarily malicious.
Conditional or unsolicited offers from strangers
☞ A telephone caller or a web page tells you that you have a “virus” and offers to help you remove it. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
☞ A web site offers free content such as video or music, but to use it you must install a “codec,” “plug-in,” "player," "downloader," "extractor," or “certificate” that comes from that same site, or an unknown one.
☞ You win a prize in a contest you never entered.
☞ Someone on a message board such as this one is eager to help you, but only if you download an application of his choosing.
☞ A "FREE WI-FI !!!" network advertises itself in a public place such as an airport, but is not provided by the management.
☞ Anything online that you would expect to pay for is "free."
Unexpected events
☞ A file is downloaded automatically when you visit a web page, with no other action on your part. Delete any such file without opening it.
☞ You open what you think is a document and get an alert that it's "an application downloaded from the Internet." Click Cancel and delete the file. Even if you don't get the alert, you should still delete any file that isn't what you expected it to be.
☞ An application does something you don't expect, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
☞ Software is attached to email that you didn't request, even if it comes (or seems to come) from someone you trust.
I don't say that leaving the safe harbor just once will necessarily result in disaster, but making a habit of it will weaken your defenses against malware attack. Any of the above scenarios should, at the very least, make you uncomfortable.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it—not JavaScript—in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a padlock icon in the address bar when visiting a secure site.
Stay within the safe harbor, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself.
7. Never install any commercial "anti-virus" (AV) or "Internet security" products for the Mac, as they are all worse than useless. If you need to be able to detect Windows malware in your files, use one of the free security apps in the Mac App Store—nothing else.
Why shouldn't you use commercial AV products?
☞ To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. This technique is a proven failure, as a major AV software vendor has admitted. Most attacks are "zero-day"—that is, previously unknown. Recognition-based AV does not defend against such attacks, and the enterprise IT industry is coming to the realization that traditional AV software is worthless.
☞ Its design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere. In order to meet that nonexistent threat, commercial AV software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
☞ By modifying the operating system, the software may also create weaknesses that could be exploited by malware attackers.
☞ Most importantly, a false sense of security is dangerous.
8. An AV product from the App Store, such as "ClamXav," has the same drawback as the commercial suites of being always out of date, but it does not inject low-level code into the operating system. That doesn't mean it's entirely harmless. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
An AV app is not needed, and cannot be relied upon, for protection against OS X malware. It's useful, if at all, only for detecting Windows malware, and even for that use it's not really effective, because new Windows malware is emerging much faster than OS X malware.
Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else. A malicious attachment in email is usually easy to recognize by the name alone. An actual example:
London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
You don't need software to tell you that's a Windows trojan. Software may be able to tell you which trojan it is, but who cares? In practice, there's no reason to use recognition software unless an organizational policy requires it. Windows malware is so widespread that you should assume it's in every email attachment until proven otherwise. Nevertheless, ClamXav or a similar product from the App Store may serve a purpose if it satisfies an ill-informed network administrator who says you must run some kind of AV application. It's free and it won't handicap the system.
The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user, you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither can you assume that you will always be safe from exploitation, no matter what you do. Navigating the Internet is like walking the streets of a big city. It can be as safe or as dangerous as you choose to make it. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

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