OS X Crashes on the Apple loading screen

[Robert.g]

As the title says, as soon as I start up my 2006 model 24" iMac.. OS X crashes and I don't know why heh. I'm running Tiger also.

The crash happens after I select OS X from the Bootcamp screen. (I have Bootcamp from the Beta still) It gets to the little gray Apple symbol, loads a little and then just crashes.
I suspect it has something to do with when I updated my 7600 GTs graphics drivers in Windows as Windows continues to not work also on boot up.

You may say it's a broken mobo or displaced RAM but it isn't. When I uninstalled the the graphics cards drivers in Windows I was able to boot fine into it. The nVidia Forceware drivers were the cause, they said they were bug free ha.. if you check the nVidia forums you'll see a lot of people have this problem with Windows.
But back on topic,
I've tried reinstalling OS X by trying to boot to the disc when holding down C.. it crashes.
Holding down shift.. it crashes.

If anyone knows how I can fix this problem, please tell heh.

 

[velocityg4]

Since it still crashes when booting off the install CD it would not be problems with the nVidia drivers for Mac OS X at any rate. As the hard drive and its files play no role in the booting of OS X off of the CD.

Based on your description I would say you have a faulty motherboard component or a bad piece of RAM. If still under warranty I would bring into an authorized Apple service center.

Otherwise start by testing for faulty memory. Remove all external components except a keyboard and mouse. Remove one stick of RAM and try booting from the CD, as the OS X partition could have become corrupted, if that does not work try the other RAM stick. Then alternate the sticks in the other RAM slot to rule out a bad memory slot.

From their your most likely cause would be a faulty motherboard component. The less likely causes would be a faulty CPU or Powersupply. Unfortunately the only part of these that can be tested without replacement is the powersupply. If you have a volt meter and can find a pin-out guide. On the motherboard you can look for swollen and damaged capacitors but many other problems can also be at fault such a bad graphics memory, GPU, northbidge etc...