24" iMac - Mid 2007 - Windows 7 crashing!

So, I own the 24" iMac from mid 2007, it's running Windows 7 Home Premium with SP1 and 32-bit OS. Everything is up to date and I'm using the latest version of Boot Camp.
But here' the issue, every so often maybe once every half hour on a bad day, my iMac will do one of two things. The screen will either turn completely black or the screen will freeze - either way the computer is stil running,the fan is still on the hard disk still spinning.
Here is the full list of system specifications: http://support.apple.com/kb/sp16
I don't know what the issue is as everything is fully update including Boot Camp, Windows updates and graphic drivers - which would be a sensible guess as to what is causing the problem.
Thanks, Seb.

I'm fairly certain that you cannot use a 75GB Windows partition formatted as FAT.
I think it has to be NTFS if it is more than 32GB.
This is from an older version of the Boot Camp installation guide (OS X 10.5)
One other possibility is that the default Windows video driver used at installation is somehow incompatible with your ATI Radeon chipset. ATI has an Apple Boot Camp driver here http://www.official-drivers.com/installer/?seed=ati&gclid=COOhrP6Vq60CFc3DKgod71 _NoA
Unfortunately that download a setup.exe file, which means you have to have Windows running in order to install it, so that won't help during installation.

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Isnt line in just a fancy word for a plug that looks like headphones?
No. The term "line in" refers to the signal level the input can accept. It has nothing to do with the type of socket/plug.
I just checked what Line in is and i do have a line in spot in my mac. So why would i need to buy the IMic?
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- a microphone that puts out a line-level signal. There are a few, but not many.
or
- a USB microphone
or
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Regards.

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D.F. wrote:
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I have an SSD on this iMac and 6Gb of ram... i thought the problem was spotify but even if uninstalled it doesn't sleep.
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13/09/14 08:36:20 CEST
Assertion status system-wide:
   BackgroundTask                 1
   PreventDiskIdle                0
   ApplePushServiceTask           0
   UserIsActive                   0
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No i've checked that before posting and i did all that steps... anyway i think i resolved my issue...
Even reinstalling mavericks didn't fix the issue, so i installed yosemite public beta 3 on my primary partition and that still didn't fix the problem with coreaudio...
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and
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2014-09-16 23:27:03 +0200
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
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   PreventSystemSleep             0
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   id=501 level=255 0x4=USB mod=16/09/14 23:19 description=EHC2 owner=AppleUSBEHCI
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Hi
Should add that I work for an Apple Specialist/AASP
So do I.
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
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Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
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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. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

24" iMac - Mid 2007 - Windows 7 crashing!

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