Installed mac osx10.4 now my computer wont start!!

installed mac osx 10.4 on my powerbook G4 now my mac wont work when it starts up it gets stuck on the starting mac osx scren the bar across the screan only loads about 1cm accross the scren then frezzes PLEASE HELP
powerbook G4   Mac OS X (10.4)  

Reinstall whatever version you have a legitimate install disk for and then upgrade it with the combo updater. To install Tiger buy the box from a store - the one you got from somebody else's mac is configured for the hardware specific to that mac and is causing headaches with yours.

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  • HT1349 i upgraded to yosemite last week, now my computer wont start. it stops at white screen with apple logo. what do i do?

    i upgraded to yosemite last week, now my computer wont start. it stops at white screen with apple logo. what do i do?

    Take each of these steps that you haven't already tried. Stop when the problem is resolved.
    To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
    Step 1
    The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
    There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
    a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
    b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
    c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
    d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
    Step 2
    If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
    Step 3
    Sometimes a startup failure can be resolved by resetting the NVRAM.
    Step 4
    If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
    Step 5
    If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
    Step 6
    Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
    Step 7
    If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
    Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
    Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
    The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
    If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
    If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
    Step 8
    Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
    This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
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    If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.  
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    Step 12
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    If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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    I keep getting a message about my disc being unable to be repaired and it wont install the mountain lion or my old 10.6.  Any suggestions??

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    Problem description:
    slow at start up, screen is distorted while logging in, it is fine after
    EtreCheck version: 2.1.8 (121)
    Report generated April 5, 2015 at 9:42:01 AM PDT
    Download EtreCheck from http://etresoft.com/etrecheck
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    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
        MacBook Pro (13-inch, Early 2011) (Technical Specifications)
        MacBook Pro - model: MacBookPro8,1
        1 2.3 GHz Intel Core i5 CPU: 2-core
        4 GB RAM Upgradeable
            BANK 0/DIMM0
                2 GB DDR3 1333 MHz ok
            BANK 1/DIMM0
                2 GB DDR3 1333 MHz ok
        Bluetooth: Old - Handoff/Airdrop2 not supported
        Wireless:  en1: 802.11 a/b/g/n
        Battery Health: Normal - Cycle count 297
    Video Information: ℹ️
        Intel HD Graphics 3000 - VRAM: 384 MB
            Color LCD 1280 x 800
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        OS X 10.10.2 (14C109) - Time since boot: 0:7:0
    Disk Information: ℹ️
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            EFI (disk0s1) <not mounted> : 210 MB
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
            Macintosh HD (disk1) / : 318.84 GB (174.85 GB free)
                Encrypted AES-XTS Unlocked
                Core Storage: disk0s2 319.21 GB Online
        MATSHITADVD-R   UJ-898
    USB Information: ℹ️
        Apple Inc. Apple Internal Keyboard / Trackpad
        Apple Inc. BRCM2070 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Inc. FaceTime HD Camera (Built-in)
        Apple Computer, Inc. IR Receiver
    Thunderbolt Information: ℹ️
        Apple Inc. thunderbolt_bus
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        HP Trap Monitor: Path: /Library/StartupItems/HP Trap Monitor
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        [failed]    com.apple.ucupdate.plist
        [failed]    com.apple.watchdogd.plist [Click for details]
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        [not loaded]    com.google.keystone.agent.plist [Click for support]
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        [not loaded]    com.logmein.LMILaunchAgentFixer.plist [Click for support]
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        [not loaded]    com.logmein.logmeinguiagent.plist [Click for support]
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        [not loaded]    com.adobe.fpsaud.plist [Click for support]
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        [not loaded]    com.logmein.logmeinblanker.plist [Click for support]
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        FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
        LogMeIn: Version: 1.0.660 [Click for support]
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        LogMeInSafari32: Version: 1.0.660 [Click for support]
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        AdobePDFViewer: Version: 10.0.1 [Click for support]
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        Flash Player  [Click for support]
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    Top Processes by CPU: ℹ️
             7%    ocspd
             4%    WindowServer
             1%    kextd
             0%    ps
             0%    securityd
    Top Processes by Memory: ℹ️
        137 MB    Microsoft Word
        120 MB    Safari
        86 MB    ocspd
        82 MB    CalendarAgent
        77 MB    WindowServer
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        310 MB    Free RAM
        1.89 GB    Active RAM
        1.55 GB    Inactive RAM
        544 MB    Wired RAM
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