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I have the HP DV6661 laptop (core2 duo T7250, NV 8400M GS). Since now I had the Snow Leopard IATKOS updated succesfully up to 10.6.8 with minor problems (intel 3945 wifi doesnt work - probably will never do, firewire RICOH OHCI worked in 10.6.5 didnt work in 10.6.7, worked again in 10.6.8 - weird!!). I purchased ML, made a bootable clone of my SL partition with SuperDuper!, and tried installing (clean install - ######+###### method) ML first in an external HD and after success in my specific internal HD partition. In the proccess I found out what kexts I need, what boot flags to use etc. ( EvoReboot, FakeSMC, NullCPUPowerManagement, ElliotForceLegacyRTC, AppleRTC patched, org.chameleon.boot.plist with EthernetBuiltin=Yes, GraphicsEnabler=Yes, smbios.plist and chimera bootloader, + Voodoo 0.2.1 (stable) + Ethernet Gigabit +PS2 keyboard/mouse) Since I have a lot of work/accounts/keychains/developer stuff in my SL installation, the 1st time I boot into ML I tried to migrate from my external HDD copy of SL. The procedure ended with KP, and as I discovered the old (SL) kexts were copied also. Deleted them, repaired permissions but ended up stuck at [pci configuration begin]. If I boot with npci=xXXXX I get stuck a bit later. PCIRootUID=x, -x, -f, changhes nothing Made a copy of the copy of SL where I removed all the kexts in S/L/E , all the contents of Extra, all the caches in Library and System/Library as well as the old com.apple.boot.plist. Reinstalled (same method) ML and tried to migrate from the new copy but had the same problem. Tried to install ML over the previously mentioned copy of SL with the same results. I would be gratefull for any ideas. What else could I remove from the SL IATKOS installation so that migration or update works well? Is there another way (manual or sth else) to get all my data, apps, prefs, keychains, accounts from the SL to ML without messing up the system? Many thanks in advance for any thoughts.