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12-19-2010, 10:03 PM
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Join Date: Apr 2009
Location: Earth
Posts: 187
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Snow leopard can have different effect to all people's BIOS, so I'm not sure about the checksum error.
Please could you post an image of this KP? You haven't given us much info here.
You could try booting up with -s and when it's loaded, if the problem is affiliated with AppleHDA
Code:
mount -uw /
rm -Rf /System/Library/Extensions/AppleHDA.kext
exit
and then see if the machine boots.
My Specs 
System: Custom Built
Mobo: ASRock Z68 Extreme4 Gen3
OS:Mac OS X MountainLion 10.8.2 & Windows 7 Ultimate x64
CPU: Intel Core i7 2600k @ 4.2GHz
Memory: 16GB DDR3 XMS3 1600MHz
Graphics Card: AMD Radeon HD 6870 1GB
Email/Gtalk:
[email protected] 
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