Bootcamp will not boot windows7

After a Mac software update and no other changes, I can no longer boot my Windows 7 partition. When windows can't boot it puts up a screen to troubleshoot and the only error found is: "System files integrity check and repair error code 0x490 According to what I could find online the MBR was somehow corrupted. From the command prompt I tried
BootRec.exe /fixmbr
/FixBoot. Writes a boot sector onto the system partition to start Windows
/ScanOs. Scans all disks for Windows installations and displays them to you.
/RebuildBcd. Scans all disks for Windows installations and prompts you to pick the ones you want to add to the BCD.
All say they complete successfully but Windows still won't boot.
I also tried repair from the Windows 7 installation disk with no success.
Can anyone tell me how to get Windows 7 to boot without having to wipe out the partition and start over? I really don't wnat to have to loose all my data on the Windows partition and have to reinstall.
Thanks

Sorry maybe I wasn't clear in my original post, or maybe I just don't understand the responses. I had a perfectly fine, working bootcamp installation of Windows XP on my MacBook Pro for 2-3 years now. All of a sudden after using the laptop on and off all weekend, Monday morning comes and the black screen comes up. I tried booting up with the windows disk in and tried a repair but that didn't finish. I can't do anything in BootCamp Assistant because of the message that I mentioned. I don't know what else to do from here. I was able to take all of my data off and store it on another drive, so I can, if need be wipe it clean. I'm guessing I'd have to do this on the Mac side as I don't seem to have any other options. It just doesn't make any sense to me that I'd have to start over and reinstall OS X since it seems to be working fine...it just seems like it's BootCamp.
Does this make sense? Any ideas?

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MacPro 1,1 Bootcamp will not boot my SSD?

I picked up a Crucial M4 256GB SSD to replace my existing Bootcamp Hard Disk for my MacPro 1,1 (2006).
I used Casper 7.0 to clone my Windows drive to my SSD, so far all good (I've used Casper before to do the same task without issue).
I even made sure I got my Crucial M4 SSD firmware updated to the latest rev 0009 (it was 0002).
So I boot my MacPro and hold down option, I see my new SSD (Windows) and select it for boot. I get the usual screen flash, wait a few seconds, and the cursor in the upper left corner of the monitor. Now the bad part, the blinking cursor never goes away ... just sits there (for hours) and never boots into my Windows SSD.
I don't any errors, nothing at all, just a blinking white cursor (underscore character) in the upper left corner.
Anyone else having problems boot to SDD with Windows on it? I don't know if this is just a Crucial M4 SSD problem or if it's any SSD? Is it due to MacPro 1,1 generation?
Any hints or suggestions or am I just out of luck?
Thanks, Rob.

Window boot drive is in Bay 4. After the clone process I remove the HD that works fine from Bay 4 and slide in the SDD to Bay 4 ... so it's using the same drive bay.
Pretty sure it's not a clone problem (tried Acronis also) as I've used this same software before to clone HD to HD and my MacPro booted fine into them. I'm not even getting to the point where it tries to load Windows ... it's stuck at a white cursor (underscore character) in left upper corner of monitor.
I have a call out to Crucial to see what/if they have any comment. I'm thinking that my MacPro is SATA I and that this SSD is SATA III/II and hence doesn't support SATA I -- wild guess at this point as I thought SATA II and SATA III were supposed to be backwards compatible with SATA I.
Is there any way to get into the Apple EFI32 ROM?? Is "holding down Option" during boot the only process ... are their any other special key sequences that can be used during boot? The SSD shows up when I boot into OS X and also shows up when I boot into Windows, just can't seem to boot to the SSD.
Thanks, Rob.
EDIT: found a very interesting discussion here: http://forums.macrumors.com/showthread.php?t=760482

Intel iMac will not boot past gray screen

Intel iMac will not boot past gray screen
my system:
new (month old) 24" intel imac, 2.8 ghz, 4 gb ram.
running: leopard (upgraded from tiger, which was pre-installed at purchase), installed 10.5.1 update right before this huge problem occurred.
install discs on-hand: two-disc tiget set, single leopard upgrade disc.
what led to this:
i wanted to install windows using bootcamp on a 50 gb partition.
at this point i was running leopard 10.5
i followed all bootcamp instructions, printing out the guide, as well. once i got into the windows setup, i was prompted to choose a partition to install windows. unlike the bootcamp guide, which showed three partitions, one clearly labeled "bootcamp", i saw only one partition. not wanting to risk writing over my mac partition, i quit the setup and rebooted the mac os. after some googling around, i looked for firmware updates (didn't need any), and then software updates. i decided to try updating to 10.5.1.
i then ran through boot camp again, deleting my previous windows partition, creating a new one, and moving forward as before. once again, i was only shown one partition to choose from in the windows setup. i exited the setup again to reboot through the mac os, but this time, i was only given a blank gray screen.
here's what i have tried so far:
booting from a CD, holding down the C or D keys: no response (in fact, i have to restart the computer holding down the mouse button to be able to eject the CD)
booting with option key held down: gray screen
booting with option key held down with external bootable firewire drive attached: the firewire drive appears as a boot icon, and i can click on it within a five second window, but then the screen freezes after that time period, and nothing changes
booting into target mode while attached to another mac: gray screen (no firewire icon, and drive never shows up on other mac)
resetting NVRAM: i'm able to hear the boot chimes, but no difference in performance. gray screen every time
Safe boot: nothing but a gray screen
Verbose mode: gray screen
Single user mode: gray screen
Single user mode with firewire drive attached: occasionally (not every time), i am able to get the white on black terminal to show up. from here, i'm able to run fsck, but it appears to only be checking the firewire drive. i have tried several times to boot from here, and once it took me to a blue screen with movable arrow cursor, but it never went beyond this.
is there anything else left to try before taking it to apple?
any help would be greatly appreciated.
thanks,
Casey Burns
Casey Burns Illustration and Design
http://CaseyBurns.com

I'd call Apple support at this point. You'll need
to put this issue on the record.
Call U.S. iPod and Mac technical support: 1-800-APL-CARE (1-800-275-2273)
The wait may be long for an agent to come on the line
so expect that and have some other stuff to do in the meantime.
If you have the applecare protection plan, I'd ask about "onsite"
service.
I like your work ! Good luck !
Slim
Message was edited by: slimpikkunz

Can i install windows 7 via bootcamp (MB Air) while using remote disc? I put the windows 7 disk in my macbook pro drive, and connect to my brand new macbook air. In bootcamp i allocate the partition then i click install and bootcamp will not see the disk.

Can i install windows 7 via bootcamp (on my MB Air) while using remote disc? I put the windows 7 disk in my macbook pro drive, and connect to my brand new macbook air via remote disk. In bootcamp (on my air) i allocate the partition, then i click install, and bootcamp will not see the disk from my macbook pro's drive. How do i get the bootcamp assistant running on my MB air to automatically find the disk in my macbook pro with the ISO image of windows 7? The remote disk on my air can find the cd but bootcamp will not begin installing it. Anyway to do this without buying the damned usb drive?

I don't know first hand if you can use the Remote Disk option with Windows but as of 10.7.2 you can now use BCAssistant to make a bootable USB (thumb drive or external disk) W7 installer with the Boot Camp drivers installed also. Have you tried that yet?

Macbook Pro Will Not Boot Windows Disk

I have a late 08 (or early 09) Unibody Macbook Pro 2.53Ghz. I start the Bootcamp Assistant and successfully create my Windows partition. When I restart with the Windows 7 disk, I get a blinking cursor for 1 second then it goes to a black screen and never leaves. I have tried several different Windows 7 disks with the same result. I have even tried booting from a Windows Vista, Windows XP and even a Ubuntu disk all with the same result, stuck at a black screen.
I took the hard drive out of this mac and put it into my wife's older Macbook pro, and it booted off the Windows 7 disk and completed the install to the drive with no issues. I then put the hard drive back into my Macbook Pro and get the same black screen when trying to start the Windows partition, and still have the same problem that it will not boot from any other OS disk be it Windows or Ubuntu. It boots from OS X DVDs without a problem.
Also several months ago I had a Windows XP installation on this computer with no issues. I wiped it just before going to Snow Leopard.
Any clue as to what is going on here?

What is really odd is if I take my hard drive out of my Unibody Macbook Pro and put it into my wife's non-unibody Macbook Pro, it boots the Windows partition with no problem (Remembering I previously swapped these hard drives to complete the Windows installation to my hard drive). Seeing as the disk boots on her machine fine and not in mine, and my Windows cds (DVDs) boot fine on hers and not on mine, it seems to me it's something specific about my machine, but I can't imagine what it is.

Intel IMac will not boot OSX Tiger

Hi guys, I just wanted to let you know that I am reading and trying to do my home work on why my Intel I-Mac will not boot. It all started after running Windows Vista using Apple Boot Camp. I just wanted to list a few things I have tried after getting replies from posting in some other forums. I will try here since a few people are having similar issues. Any tips would be appreciated. Please no flames
1. If I hold the C button while booting to boot from CD-ROM I get a panic alert.(panic alert meaning lockup, I have to restart or press and hold power button)
2. Holding down D button upon startup will run Apple Hardware test just fine, but no errors found.
3. I can press Option-Command-P-R to reset NVRAM successfully.
4. I can press Option during startup to start the Startup Manager. I can see my Macintosh Hard Drive and CD-ROM, but get a panic alert if I click on either icon. I’m not sure what happened with the Windows Vista hard drive Icon.
5. I can press N during startup to start up from a compatible network server. I see a flashing globe and then a panic alert. Not sure what this function is for.
6. If I press T during startup for Start up in FireWire Target Disk mode, I get a weird symbol that looks like a Y floating around the screen. I have no idea what target disk mode means.
7. If I press Shift during startup to boot in Safe Boot mode, I get a panic alert.
8. If I press Command V during startup for Verbose mode, it appears that I am at a Unix style Command Prompt that hangs.
9. If I press Command S during startup for Single-User mode, I am at the Unix Command prompt which works, but I do not know any commands except fsck –fy which I guess is like a DOS CHKDSK command that tells me my Volume appears OK.
10. Pressing Option-N during startup to start from a NetBoot server using the default boot image gives me the flashing globe icon again, and then hangs.
11. I tried resetting the System Management Unit thanks to the Unix forum guys, but still have the same problems.
12. My next step is to find a Mac friend to burn the Firmware Restoration CD file I downloaded thanks to Michael from the Unix forum. If that does not work I will try whatever you ask.
13. I can boot my I-Mac using a Linux Live CD called Slax and surf the net and play with the software. It runs just great; I just don’t think this 200MB version has the capabilities to format the hard drive or Install to hard disk like Fedora Live does. By the way, the Fedora Live version of Linux hangs after booting from the CD. It boots just fine on my PC.

Greetings,
Somehow or other you will need to be able to boot to the Installation Disk #1 that came with your computer - as you know they are specific to each machine model. After a successful boot to that disk, you can use Disk Utility to remove all of the partitions, wipe that puppy clean, then repartition and make sure you use the GUID partition scheme - you really only need the Bootcamp Assistant if you have multiple drives, internally, and since you have an iMac, your good to go.
When you booted to your Linux disk, could you see the internal hard disk? If so you should be able to open one or two of the folders just to be sure that the disk is OK.
A worst case scenario would be to have to install a fresh hard drive. Do you have any way of borrowing another install DVD for that model to try to get it to boot? That's the key to this whole project.
Try this - Go back into single user mode and issue these two commands in this order:
/sbin/fsck -fy
/sbin/mount -uw /
Watch the spaces and then issue a "reboot" at the prompt.
During this, the fans will likely come on at a high speed and may stay on for a while and maybe until you do a shutdown and reboot.
I hope this helps a little, and once you get the machine booting to the Installation Disk #1, again, you'll be all set.
You don't say, but is this unit under warranty - I know it may be a stupid question on my part, but if it is, give them (Apple) a call and get some advice on the waranty actions.
Good Luck my friend.
Cheers,
M.

The system will not boot

Hello, I am trying to install windovws after the restart can not install Yosemite because can`t please format the hard disk.Please help because just yesterday bought macbooc

FYI...the top partition is too full. You need free space. You will need to remove the bottom partition then make the top partition larger. Make sure you have 10% or more free space. If you use Parallels or VMware you don't have to partition your drive. If you use the vm software you can run Windows wihtout having to reboot into bootcamp each time you want to use it.
See this link for help after you resize your top partition.
https://www.apple.com/support/bootcamp/
I forgot to ask...
If the system will not boot, how are you seeing Disk Utility. Are you booted from the Recovery Drive? If yes, then you will need to erase the internal drive and reinstall Yosemite on the internal. When you erase, make it one partition. You can add a second partition later that's smaller.
Note: you posted in the OS X 7 Lion instead of the Yosemite forum. In the future, asking on the correct forum gets the best answers.
Parallels http://www.parallels.com/
VMware Fusion http://www.vmware.com/products/fusion/

MacBook (not unibody) will not boot from Boot Camp USB Key

Hello
I have a MacBook Pro 2007 (17", 2.4GHz, 4GB RAM and SSD) with a defect SuperDrive, and I want to install Windows using an USB key instead. But the computer will not boot from the USB Key, even though the USB key works on my MacBook Retina. Also I was able to install Mountain Lion using USB Key, on the MBP 2007.
Here is a bit more details:
I've installed Mountaion Lion from the same USB Key (so boot from USB works).
I've installed a Windows 7 Boot Camp using the SuperDrive before (when it was not defected)
I've partitioned the harddisk using the Boot Camp assistant (this requires a Windows DVD in the SuperDriver... however it worked just enught to be able to have OS X recognize the Windows DVD, and create the Boot Camp partition). So far so good. Installing from the SuperDriver howerver does not work.
I've created an Windows USB Key using my MacBook retina. Because the Retina does not have a DVD, the Boot Camp assistant offers the creation of a bootable Windows USB Key from an Windows ISO file. I've used this USB key to install Windows on my MacBook retina.
When I try to boot my MacBook 2007 with this Boot Camp USB Key, it shows an "EFI Boot" option (with a orange USB logo) in the MacBook boot menu. When I select this nothing happpens. The mouse freezes, and the computer never boots.
Questions:
Shouldn't I be able to boot from an EFI USB Key on this MacBook 2007, when I'm able to install Mountain Lion using a USB Key?
When I installed BootCamp using the SuperDrive, I had to do som "magic" to make it bootable. Like this: http://www.logicalvue.com/2009/10/installing-window-7-x64-on-a-macbook-pro-using -bootcamp. I tried doing the "oscdimg -n -m -bc:\efi-dvd\boot\etfsboot.com c:\efi-dvd c:\efi-iso\win7x64.iso" trick and create a EFI bootable ISO and created the from this USB key using http://unetbootin.sourceforge.net/. Same result... the USB key shows up in the boot menu, but nothing happens when I select it (except the mouse freezes).
Any suggestions? Right now it feels like I have a bricked computer, because my kids needs Windows to run their games.
: Thomas

Thanks... I just tried rEFIt... and it almost worked.
After installing rEFIt I got several different boot options:
Bootmgr.EFI - This failed quick with a "unsupported" message
Bootx64.EFI - This actually started the Windows installation with "Loading files.............". But after a few minutes when all files was loaded, the screen went black. I tried ataching an external screen, but the screen was still black.
Boot from "Bootcamp" drive... as this drive is empty nothing happend.
Boot from "USB Key"... I'm not sure how this is different from the first 2 options... but nothing happend. I belive this is what happens if I try selecting the USB key from the build in boot manager.
Ofcause, whan I saw the "Loading files......" I thought I solved the problem, but as you can tell, I'm still stucked.
Actually... I tried with both Windows 7 64 bit, Windows 8 64 bit and Windows 8 32 bit. Only Windows 8 64 bit, got me to the "Loading files.....". This was created with the Retina Boot Camp assistant.
I also tried my own home made Windows 7 and Windows 8 ISO (created with this link: http://www.logicalvue.com/2009/10/installing-window-7-x64-on-a-macbook-pro-using -bootcamp).
I guess my problem is another now. I'll continue my hunt... but I don't have more time right now. So I've installed Parallels and Windows 8 for my kids. Not optimal, but at least the can play their games.

Bootcamp will not read Windows 7 DVD.

When attempting to install Windows 7, bootcamp will not read the Windows 7 disk (DVD disk purchased from Microsoft). Message tells me disk is blank. Inserted disk in a Windows PC, confirmed Windows 7 disk has all data on it.
MacBook (regular) mid 2008 running OSX 10.8.2, Bootcamp 5.0.

If you want to run MS Windows Simultaneously with OS X you can buy either Parallels or VMWare Fusion. Follow the installation instructions for the app you choose, both do the same thing. There are several advatages of using Parallels or Fusion including:
1. Running OS X & Windows simultaneously
2. You can run Windows XP, Vista and/or Windows 7
You can also use Boot Camp which comes with OS X to run Windows 7. The downside is you can only run one operating system at a time, either MS Windows or OS X. If you are a Windows gamer this is the best option for 3D gaming. In order to install follow the instructions in Boot Camp Assistant, you can find BCA in Applications - Utilities - Boot Camp Assistant and then follow the on-screen instructions.

Installed Leopard 10.5.1, Will not boot into Win XP

I installed Leopard recently on my work laptop.
Before it had 10.4.11 and Win XP properly working on it.
Now after Leopard was installed, It will not boot into Win XP,
just gives a Black Screen and never progresses past that,
I hard reboot, and it boots fine back into Leopard.
All software updates up until 10.5.2 have been applied,
will applying 10.5.2 fix this issue?

All my financial records are on the Windows side of the iMac. I've used BootCamp for more than a year, I have MacOS 10.5 (very recently updated from 10.5.1 to 10.5.2), and there has been no problem with starting Windows until today. When I restart and hold down the option key, it always boots up into the MacOS. How do I get Windows?

POSIX Error / Will Not Boot

I have a Seagate Momentus XT 500GB HD in my Macbook Pro, and it will not boot. It gets to the loading screen with the apple and the spinning circle, but it just hangs there.
I tried booting from the Snow Leopard installation disk and formatting with Disk Utility, but it gives me that infamously mysterious "POSIX: Cannot allocate memory." error.
I tried taking the hard drive out and connecting it with a SATA to USB adapter, and Disk Utility could easily format and re-install OS X SL on it, and the computer would boot from it as an external hard drive. I tried installing the HD back into the laptop and it wouldn't boot again, which lead me to believe that it was an issue with my laptop, not the hard drive.
I then took it out and connected it to a Windows computer with the SATA to USB, and it worked like normal; I could browse the filesystem (I had the BootCamp HFS+ drivers installed).
I just took my old external hard drive out and took it apart. I put that hard drive into my laptop and am booting it from the SL install disk and was going to try to format that. For some reason, that hard drive just doesn't show up in Disk Utility, so I'm assuming that that hard drive is just broken by itself, although it worked with the SATA to USB adapter. But that's a completely different issue that I don't really care about anyway right now.
I just want my normal hard drive to work. The laptop is out of warranty, and I don't really want to buy a $250 or howevermuch Apple Care warranty just to get this one thing fixed, because this is obviously Apple's issue (I come to this conclusion from reading many other threads that contain less detail, but end up with the same issue as me).
I did try resetting the NVRAM and booting into single user mode and typing "fsck -fy" or something along those lines... I don't feel like looking up the place I found it. But yeah, I've tried those both.
Any suggestions? Thanks a ton; I need this computer for school...
Message was edited by: Ben Alt.

Lol yes, it is my issue in that sense. What I meant though is that it's an issue caused by a defect that Apple should solve. I say this because I've seen other people with the same problem. But yes, it is my own issue that I need to solve.
I thought of the ribbon cable, too. To be honest, I'm not really comfortable bringing it into the Apple Store. Do you think it'd be a good bet to just try the ribbon cable first, and then if that doesn't work to bring it into the store?
I found the cable on iFixit for $39.95. Do you think that's a reasonable price?
Thanks for the quick reply!

2009 Mac Pro will not boot up under Windows

I have an Early 2009 Mac Pro system (Mac Pro 4,1) and I've had this system for 3 years already and have been working under OS X with this system ever since I purchased it.
However, when I tried to boot off my Windows disk, something very interesting happens. The Mac Pro WILL NOT boot up off the Windows disk or a known working Windows partition if two monitors are connected. Upon holding down the option key and selecting the Windows partition, I will get a black screen on one monitor (the one connected via Mini Displayport) and the other screen receives no signal and will enter standby and the system is halted. It does not respond to keystrokes, there is no hard drive activity, no measured power increase on the UPS, no apparent network activity, nothing. The only way to exit this scenario (from what I can tell) is to power off the machine, disconnect the display on DVI, power on the machine again, select the Windows partition wait for the system to reach the login window and reconnect the DVI monitor (at which time Windows recognizes it immediately and the system works fine again).
My question to the community is, does anybody know why this is happening and is there a known fix for this? Quite frankly, having to disconnect a monitor just to restart is very tedious and frustrating.
I have two Samsung P2350 monitors attached to an ATI Radeon HD 4870 (512MB, from Apple). One is monitor is connected via directly DVI and the other is using a Mini Displayport to DVI adapter. Both monitors work fine under OS X with no issue. At first, I thought that this may be a driver issue on the Windows side and after installing all the latest updates and drivers the issue is still apparent. From what I can tell, this doesn't seem like a software issue but rather a firmware or EFI issue as this happens before Windows even loads.
If anyone knows of a fix or what to do in this situation, or if you are also having this issue, I would love to hear your input!
Thank you!
For the record, I am running all the latest software builds on the OS X side (10.7.4, not that it would really matter at this point). I have also disconnected all unnecessary equipment in a trial and error scenario but the results are still the same.
The system passes all ASD testing.
The full specification of the computer and all connected equipment are as follows:
2009 Mac Pro (4,1) 8-Core
2x Intel Xeon Nehalem 2.66GHz Quad-Core CPUs
16GB DDR3 ECC 1066MHz RAM (Apple Branded)
Two OWC 120GB SSDs (One for OS X, the other for Windows 7 x64) - These are in place of my optical drives.
4x 2TB WD Black Hard drives for storage.
Two Samsung P2350 Monitors connected via DVI. (One using a Mini Displayport to DVI adapter).

In Windows I am using the latest (12.4) Catalyst Software Suite, 64 bit of course, downloaded directly from AMD's site after installing the drivers from Boot Camp.
As for installing Windows I used an original (not burned) installation media (Disk is in a pristine condition). And yes, Windows is fine, the problem just seems to be getting the system to boot up Windows with that second monitor. However if the "problem monitor" is disconnected the system boots fine 100% of the time and connecting it later after booting the system will still operate properly.
For the sake of arguement I swapped monitor cables and connected the "second" monitor to the mini displayport adapter to verify that it wasn't a cabling issue and I'm still yielding the same issues.
As for GPU testing, I've played games (Crysis, Grand Theft Auto IV, Battlefield 3, etc.) and I've had no issues with the card or stability.
You would think that Apple would try to find a fix for this, especially considering the caliber of this machine.

Macbook Pro will not boot up normally ***Not Normal Problems***

Ok. I have an older 17" Macbook pro 2.33 (10.6 fully updated) that will not boot up in normal mode. When I boot it shows "blocks" of different colors and will not get past the blue screen sometimes. When it does get passed the the blue or grey screen it is a split screen of white back ground with large black blocks seperating the sides. I have tried swapping out harddrives with a known working one with an OSX image on it-no good. I have tried swapping out ram-same thing. I reset the SMC and PRAM-only colors changed in the blocks. I have ran disk utilites disk and permisions with no problems. I can't boot into a restore disk using the c key during boot, It locks up at the same screen. Nothing works except safe mode. I can boot into safe mode and everything works just fine with normal screen and all. Now I tried runing the Lion installer thinking it is and driver issue but I can't get Lion to boot to the hard drive and Snow leopard just reboots back to the same screen. So how can I get Lion to install or Snow Leopard?
What can I do? I noticed this last weekend when I tried to reboot my MB Pro and it started this. Well Apple pushed and update last friday - I needed to restart it again and this happends. I thought it was a logic board at fist until it booted fine in safe mode.

Sorry. What I mean is I selected the SL boot up in the start up panel and it would not boot into the cd. The CD rom sounds like it just keeps reading with it slowly loading from grey screen to blue screen to the Block screen. Almost like it is booting into normal mode from the hard drive.
What I can't understand is why it runs fine is Safe mode?
Also why do I get a " this disk cannot be used to start up your computer" message on my hard drive when trying to install Lion in safe mode? Well why not it's the only hard drive in the computer?
The first screen shot is the Tech tool showing everything passed the hardware test is safe mode.

IMac Late 2006 Will Not Boot Up

I have a late 2006 iMac. The problem I have is that it will not boot up. I press the power button and the light comes on but the display is blank. Do you all think the problem is the logic board?
Thanks in advance,
Andrew

Could be. Is it that the display is blank but the system is running???? If so, what if you connect an External Monitor.
My iBook has been having Logic Board issues similar to what you say though, but it's because of a chip on the lower side of the board that become desoldered. I ended up putting a small piece of rubber onto it to apply pressure onto the chip once I reapplied the case/undercover. It works & I backed up everything, but it sometime acts up again with similar symptoms as your iMac.

I am in mavericks disk utility recovery mode as my mac book will not boot up & stays only on the grey apple screen. When I verify the disk I get open error5 :input /output error on Syst stuck on 1 minute pouring out over 50 error messages & still counting

I am in Mavericks disk utility recovery mode as my mac book pro will not boot up & stays on the Apple grey screen . When I verify disk permissions I get
Open error 5:"input/ output error" on syst with over 50 of this messages & still counting . Disk Utility says 1 minute
But this has been going on for over 10 mins .
I can not verify disk or repair disk .
I have tried to reinstall mavericks operating system but it says my hard drive is locked which is very strange .
Does anyone know what is going on here ?
My system looks like it has been totally corrupted . Thanks Andrew

Could be. The "lock" isn't actually looking for a password.
WARNING: This will completely erase the ENTIRE hard drive.
What you would need to do is boot to recovery > disk utility > select the MAIN drive on the left side > partition > change partition layout from CURRENT to 1 PARTITION > ensure on the right side it says Format : Mac OSX Extended (Journaled) then push APPLY.
Then if it will allow us, close the windows until you see the 4 options popup again and select "Reinstall Mac OS X" select the Mac HD and you should be good to go!

Bootcamp will not boot windows7

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