IMac8,1 running Snow Leopard with 64 Bit kernel and dual monitor

I've got an early 2008 Imac with an ATI Radeon HD 2600 Pro card running Snow Leopard 10.6.3.
When I run the kernel in 64 bit mode the second display turns on and off periodically. Running in 32 bit mode it's fine.
Is this a known issue?

AFAIK, Mac Pro (2006) is EFI32 and is not capable of booting the 64-bit kernel, but the system is fully capable of running 64-bit applications using the 32-bit kernel.
This question can be confusing and context-dependent, and there can be different reasons for asking about the "64-bitness" of the kernel. Particularly whether the application support for 64-bit is available, and whether the kernel itself is 64-bit.
For 64-bit application support. AFAIK, you have that.
For 64-bit kernel support, and the associated requirements for having 64-bit kernel extension (kext) support for your applications, and AFAIK, you don't have that.
See [Mac OS X v10.6: Starting up with the 32-bit or 64-bit kernel (ht3773)|http://support.apple.com/kb/ht3773] for the mechanisms available for Snow Leopard and Snow Leopard Server, if you want to test your current configuration. AFAIK, you have a 32-bit kernel.
You can join the Apple developer program and then download the developer preview of [Mac OS X Lion release|http://www.apple.com/macosx/lion> if you want to learn more about that topic.

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