I am having some problems installing Mountain Lion.
CPU: Intel i7-2600K
Graphics: PowerColor ATI Radeon HD 5770
Motherboard: Gigabyte Z68XP-D3, BIOS ver. F3
UniBeast ver. 1.5.3
MulitBeast ver. 5.0.2
> UserDSDT or DSDT-Free Installation
I am able to install Mountain Lion on to my HDD OK. (Able to boot to desktop using UniBeast)
After I use MultiBeast with "UserDSDT or DSDT-Free Installation" selection (DSDT.aml file on Desktop)
Mountain Lion will crash on boot up with dreaded white square with circle with diagenal line through it.
I am not even able to reboot using UniBeast. (Same dreaded white square)
It looks like I have solved the problem.
I have found through trial and error that if I select "3rd Party SATA" (AHCI_3rdParty_SATA.kext) and also "UserDSDT or DSDT-Free Installation" in MultiBeast, Mountain Lion will now boot to the desk top, with no crash.