For the first time ever, an OS X update breaks compatibility with the X58 chipset. After applying the 10.7.4 update most X58-based Hackintoshs will see (if booted with the -v option) an ACPI related kernel panic or the kernel will just hang early in the boot process with a message like
IOAPIC: Version 0x20 Vectors 64:87
IOAPIC: Version 0x20 Vectors 88:111
Reverting back to an older AppleACPIPlatform.kext will most likely bring the Hackintosh back from the dead. In order to get access to the disk you’ll need some sort of OS X boot/recovery drive. Make sure you rebuild the kext-cache or temporarily disable support for kernelcache in Chimera/Chameleon.
See this thread on insanelymac.com for a working AppleACPIPlatform.kext. Hopefully, someone finds out what changes need to be made in the boot loader and/or DSDT.