First, I've got Lion installed and working perfectly with a custom dsdt.
I read that Mountain Lion GM is out, so downloaded it.
I used "myhack" to create a bootable installation Partition/USB drive.
Tried to boot from it, selected the install partition and right before the grey BG with the apple logo it reboots.
Updated chameleon, it still reboots.
Used chameleon with default kexts etc... and it still reboots.
I've tried every possible boot combination to make it work, no luck.
Anyone got an idea?