Grey screen on startup, erratic mouse: help!

I have a new iMac 2.8 intel, after encountering many bugs getting logic 8 to run smoothly, I now find it starts just leaving a grey blank screen. I have to restart e few times before it wants to boot fully.
I managed to start it with the fireire devices on the 400 buss disconnected, tho it's started with them connected yesterday. Also the wireless mouse cursor was jumping all over the screen so had to turn it off and reset it. Can there be one cause for this behaviour?

As this the iMac G5 (PPC) forum, you would probably get a better response on the Intel iMac forums:
http://discussions.apple.com/category.jspa?categoryID=189

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  • Mac stuck at grey screen after startup sound. Help

    Help

    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.
    Step 9
    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.  
    Step 10
    Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
    Step 11
    Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
    Step 12
    This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
    Step 13
    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.

  • TS2570 Grey screen on startup...

    I am using 2008 White Macbook with OSX lion running on it. Recently I tried to update the OS and then I started getting a folder with question mark on startup. After that I started getting a continuous grey screen on startup. I tried various options like command + option + P + Q, then Command + R, etc. but did not get any response. After that I pressed option key on startup then there was a response. A lock icon appeared on screen asking for a password. I tried the MacBook password and it is not taking that password as well. I tired all the passwords I remembered but nothing worked. My cd drive is not working and also I do not have original OS disks with me now. The apple service centre told that they can resolbe it as it is a vintage model. I called apple care but they are asking 29 $ for a call Which is ridiculou. Pl. help me

    Does the lock screen look like the one on this page…
    http://osxdaily.com/2014/01/06/set-firmware-password-mac/
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    If you can't remember the password you will need to remove the battery & leave it unpowered for a few days. If you are lucky it will reset. If it doesn't reset you need to open the case & remove the internal clock battery. Not something anyone should do without the skills to work on electronics - take it to an Apple Store or an Apple approved service centre would be my advice.
    It is also possible that you have Filevault password instead of an EFI password - did you need to enter a password after every reboot before the OS failed. This shouldn't be confused with a normal user account password.
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    The 'question mark folder' means it cannot find an OS that is bootable - it need to be repaired but you can't get to recovery mode without the EFI password - a catch 22 situation.
    Since you have no install disks or other ways to boot it seems you are probably not going to be able to fix this. If you have another Mac you could try to download 10.7 & create a USB install disk & use that to try to repair the Mac, but it seems unlikely since it appears to have a firmware password.

  • HELP!!!  intermittent boot failures - grey screen at startup

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    Well I didn't get as far as the external drives when the computer did the same thing upon boot try 17 after the Epson drivers install on boot 14, boot 15 with the printer on and boot 16 with the printer off.
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  • My macbook pro wont get past the grey screen at startup. Help!!

    After doing a run of the mill software update on my macbook pro (running snow leopard) it froze during the "moving items into place" stage. I forced a shut down and now it wont get past the grey screen with apple logo and spinning wheel. I have tried booting from the original DVD but it still freezes. When I boot it in verbose mode it seems to stop at "jnl: unknown-dev: update_fs_block: error reading fs block # 3597880! (ret 5)", the Apple AHCD Disk Queue manager :: set power state is timing out and there is a disk I/O error. I have tried to reset the power manager (not sure if it worked or not) and I have also tried clearing the PRAM (again, not sure of that worked). When I try to look at the hard drive using target mode on my imac the hard drive doesn't come up but the DVD does. I'm concerned that my hard drive is fried. Any suggestions?

    It would help to state in your post which remedies you tried that didn't work.
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    Safe Mode deletes some system caches that may help.
    A Safe Mode boot takes longer than a normal boot so be patient. Once you are in Safe Mode, click Restart from the Apple menu.
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    Tip:  Hold down the Eject key while starting up your Mac to eject a disc.

  • Grey screen on startup - verbose mode:"We are hanging here..."! Please help

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  • HELP!! Grey screen at startup....

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  • I accidently put vr files in trash but did not delete, now stuck on grey screen after battery dying! Help

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    Thank you! But do you think that a defective cable would cause it to not boot the cd now as well as the HD errors?
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  • OSX Lion, stuck on grey screen at startup w/ spinning gear.

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  • Stuck on Grey Screen During Startup

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    I apologise for what will most likely be an essay ahead.
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    Eventually my brother tells me he has some spare RAM which I also try and once again, this does not solve the issue. So I figure it cannot be a RAM problem.
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    So here I am. If you could be bothered to read all of that, well done haha I'm not sure if I could have.
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    I do not have Apple Care so if I was to take it to the local Genius bar, would they look at it for free and diagnose it? Or would that cost me? I have never had to take my MBP in before.
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    I just skimmed over this because the post is like a small novel! lol Try a Apple Hardware Test. I think it's probably a bad logic board.
    http://support.apple.com/kb/HT1509
    Don't take it to a Genius Bar until you've done this, saves time and you might have a little more info to give them. Also that way you won't feel pressured into anything. It's out of warranty, so sometimes I've noticed they can be a little pushy especially on a very high dollar replacement such as a new logic board on an out of warranty item. Also the "enhanced diagnostic" is around $100, so you might have to at least fork over a hard earned Benjamin and not get anything fixed. And whatever you do, DO NOT, I repeat, DO NOT tell them you upgraded the RAM yourself. If they are feeling in a good mood and decide to knock off any money or waive any sort of fees, this will kill it instantly. RAM is considered "user serviceable," but they normally try to plead "the part you installed is not Apple Authorized" or the "installation caused the issue and was not an ACHT." Put back in the original stick and leave it alone. Hope this helps you out!

  • After update Mac Pro boots to grey screen with Kernel Panic. Help please.

    It would be great if someone can help me out. Yesterday I did a software update of iTunes and osx (it said to ease update to Lion) and now my Mac Pro tower (MacPro3,1) boots to a grey screen, kernel panic, telling me that I need to power down and restart my machine. I can boot into osx via the safe mode but unfortunately I don't have an install disk to repair the system disk. What are my options?
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    Interval Since Last Panic Report:  2403 sec
    Panics Since Last Report:          4
    Anonymous UUID:                    2F681FF9-168D-42D2-865B-C00AD4C8FA30
    Thu Oct 27 14:29:21 2011
    panic(cpu 7 caller 0x560821): "getPhysicalSegment() out of 32b range 0x3f10000000, len 0x0, class IOGeneralMemoryDescriptor"@/SourceCache/xnu/xnu-1504.15.3/iokit/Kernel/IOMemory Descriptor.cpp:1594
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    0x840b3e18 : 0x543f60 (0x8eb44000 0x15c68b00 0x1 0x506b76)
    0x840b3e78 : 0x542137 (0x15c68b00 0x8eb44000 0x16abd180 0x51a1b0)
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                dependency: com.apple.iokit.IOAudioFamily(1.8.3fc2)@0x8e635000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x8e6b2000
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    Mac OS version:
    10K549
    Kernel version:
    Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
    System model name: MacPro3,1 (Mac-F42C88C8)
    System uptime in nanoseconds: 22607847366
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    de.novamedia.driver.NMSmartplugSCSIDevice 1.0.1
    com.apple.driver.AirPortBrcm43224 428.42.4
    com.apple.driver.ACPI_SMC_PlatformPlugin 4.7.0a1
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