IMac Not Shutting Down at Times???

Hey guys, I had an issue with my iMac when i bought it a year ago where it wasn't shutting down and the top menu bar would disappear after you would click shutdown.  Then I would click on Safari and the top menu bar would reappear and I could then click on the apple icon to shutdown again.  It would work at that point.  I took it into Apple and to make a long story short they said they fixed it but when I picked it up they ended up giving me a new computer due to a whole other issue.
So that was back around June.  I was still having the same shutdown issue at times with the new machine but not as much.  Seemed like it would happen mostly if I quit Safari and shutdown the computer immediately after.  If I wait a few extra seconds to shut down after closing Safari it seemed to not give me that problem.  Sometimes it still would though.
So now I download Yosemite and now when I shutdown the same thing will happen except when I get the menu bar back and click shutdown nothing happens (the shutdown window does not come up) and I have to hold the power button down in the back to shut it off.  I have had to do this about 3 times in the past week.
I have a genius bar appointment tomorrow because I can't take it anymore and I do not want to keep putting it off.
Anybody else have this issue? 

Sometimes the system will present a dialog identifying the app that is preventing shutdown. Wait a sufficient amount of time (a few minutes is reasonable) before forcing it to shut down. The dialog may appear, or not.
You can examine system.log to determine the reason it's not shutting down. To do that use the Console app - it's in your Mac's Utilities folder. Time and date-stamped entries immediately following the shutdown request and prior to forcing it to shut down may reveal the cause. Copy and paste them in a reply to this message if you wish. Remove or obscure any information you may consider personal (such as your Mac's name).

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    The title of the Console window should be All Messages. If it isn't, select
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    Please don't indiscriminately dump thousands of lines from the log into this discussion.
    Please don't post screenshots of log messages—post the text.
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    0xffffff8078713d60 : 0xffffff80002b4b31
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    System model name: iMac10,1 (Mac-F2268CC8)
    System uptime in nanoseconds: 1750251829240
    last loaded kext at 51464252613: com.apple.filesystems.msdosfs          1.7.1 (addr 0xffffff7f815c7000, size 57344)
    last unloaded kext at 215848970782: com.apple.driver.AppleFileSystemDriver          13 (addr 0xffffff7f825c2000, size 12288)
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    com.apple.driver.AppleBluetoothMultitouch          70.12
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.iokit.IOBluetoothSerialManager          4.0.8f17
    com.apple.driver.AudioAUUC          1.59
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.GeForce          7.3.2
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleHDA          2.2.5a5
    com.apple.driver.AppleMikeyDriver          2.2.5a5
    com.apple.driver.AGPM          100.12.75
    com.apple.driver.AppleBacklight          170.2.2
    com.apple.driver.AppleMCCSControl          1.0.33
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.2.3
    com.apple.driver.ApplePolicyControl          3.1.33
    com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8
    com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17
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    com.apple.driver.AppleUSBCardReader          3.0.6
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    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          33
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCISerialATAPI          2.0.3
    com.apple.iokit.IOAHCIBlockStorage          2.1.0
    com.apple.driver.AppleAHCIPort          2.3.1
    com.apple.nvenet          2.0.17
    com.apple.driver.AppleUSBHub          5.1.0
    com.apple.driver.AirPort.Atheros40          505.67.1
    com.apple.driver.AppleUSBEHCI          5.1.0
    com.apple.driver.AppleUSBOHCI          5.1.0
    com.apple.driver.AppleEFINVRAM          1.6.1
    com.apple.driver.AppleFWOHCI          4.9.0
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.7
    com.apple.driver.AppleACPIButtons          1.5
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.5
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
    com.apple.nke.applicationfirewall          3.2.30
    com.apple.security.quarantine          1.4
    com.apple.security.TMSafetyNet          8
    com.apple.driver.AppleIntelCPUPowerManagement          195.0.0
    com.apple.driver.AppleBluetoothHIDKeyboard          160.7
    com.apple.driver.AppleHIDKeyboard          160.7
    com.apple.driver.AppleMultitouchDriver          231.4
    com.apple.driver.IOBluetoothHIDDriver          4.0.8f17
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.nvidia.nv50hal          7.3.2
    com.apple.NVDAResman          7.3.2
    com.apple.driver.DspFuncLib          2.2.5a5
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.driver.AppleHDAController          2.2.5a5
    com.apple.iokit.IOHDAFamily          2.2.5a5
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    com.apple.iokit.IOAudioFamily          1.8.6fc18
    com.apple.kext.OSvKernDSPLib          1.3
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    com.apple.iokit.IONDRVSupport          2.3.4
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    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
    com.apple.iokit.IOBluetoothFamily          4.0.8f17
    com.apple.iokit.IOUSBHIDDriver          5.0.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1
    com.apple.iokit.IOUSBMassStorageClass          3.0.3
    com.apple.driver.AppleUSBMergeNub          5.1.0
    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
    com.apple.iokit.IOAHCIFamily          2.0.8
    com.apple.iokit.IOUSBUserClient          5.0.0
    com.apple.iokit.IO80211Family          420.3
    com.apple.iokit.IONetworkingFamily          2.1
    com.apple.iokit.IOUSBFamily          5.1.0
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    com.apple.iokit.IOFireWireFamily          4.4.8
    com.apple.iokit.IOHIDFamily          1.7.1
    com.apple.iokit.IOSMBusFamily          1.1
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    com.apple.driver.DiskImages          331.7
    com.apple.iokit.IOStorageFamily          1.7.2
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    com.apple.driver.AppleACPIPlatform          1.5
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    Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
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    USB Device: Ext HDD 1021, 0x1058  (Western Digital Technologies, Inc.), 0x1021, 0x24300000 / 3
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    USB Device: Tablet, 0x172f, 0x0037, 0x26410000 / 6
    USB Device: Mass Storage Device, 0x058f  (Alcor Micro, Corp.), 0x6362, 0x26430000 / 5
    USB Device: USB 2.0 Hub [MTT], 0x1a40  (TERMINUS TECHNOLOGY INC.), 0x0101, 0x26440000 / 4
    USB Device: JumpDrive, 0x05dc  (Lexar Media, Inc.), 0xa205, 0x26441000 / 7
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 4

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    That means, in practice, that you always stay within a safe harbor of computing practices. How do you know what is safe?
    Any website that prompts you to install a “codec,” “plug-in,” "player," "extractor," or “certificate” that comes from that same site, or an unknown one, is unsafe.
    A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
    Pirated copies or "cracks" of commercial software, no matter where they come from, are unsafe.
    Software of any kind downloaded from a BitTorrent or from a Usenet binary newsgroup is unsafe.
    Software that purports to help you do something that's illegal or that infringes copyright, such as saving streamed audio or video for reuse without permission, is unsafe. All YouTube "downloaders" are outside the safe harbor, though not all are necessarily harmful.
    Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. If it comes from any other source, it's unsafe. For instance, if a web page warns you that Flash is out of date, do not follow an offered link to an update. Go to the Adobe website to download it, if you need it at all.
    Even signed applications, no matter what the source, should not be trusted if they do something unexpected, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
    "FREE WI-FI !!!" networks in public places are unsafe unless you can verify that the network is not a trap (which you probably can't.) Even then, do not download any software or transmit any private information while connected to such a network, regardless of where it seems to come from or go to.
    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 lock icon in the address bar with the abbreviation "https" when visiting a secure site.
    Follow the above guidelines, 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" or "Internet security" products for the Mac, as they all do more harm than good, if they do any good at all. Any database of known threats is always going to be out of date. Most of the danger is from unknown threats. If you need to be able to detect Windows malware in your files, use one of the free anti-virus products in the Mac App Store — nothing else.
    Why shouldn't you use commercial "anti-virus" products?
    Their 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, the 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.
    To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. Most of the real danger comes from highly targeted "zero-day" attacks that are not yet recognized.
    By modifying the operating system, the software itself may create weaknesses that could be exploited by malware attackers.
    8. An anti-malware product from the App Store, such as "ClamXav," doesn't have these drawbacks. That doesn't mean it's entirely safe. 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 anti-virus app is not needed, and should not be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
    A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
    ♥♥♥♥♥♥♥♥♥♥♥♥♥♥!!!!!!!H0TBABEZ4U!!!!!!!.AVI♥♥♥♥♥♥♥♥♥♥♥♥♥♥.exe
    Anti-virus software may be able to tell you which particular trojan it is, but do you care? In practice, there's seldom a reason to use the software unless an institutional policy requires it.
    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 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 should you assume that you will always be safe from exploitation, no matter what you do. 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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