Thanks. ML was installed successfully after removing "appleintelhd*.kext"
I have a few more problems. Probably my Acer Aspire x3900 is outdated.
1. I installed various version of Voodoo HDA but no sound . My audio is Intel 5 series/3400 Series chipset HDAudio Device ID 3b56.
2. Network is not working. I did get connected once but unplug after restart. ethernet was visible at least at that time. However, noethernet after I clean installed again after that, I installed AppleIntelE1000e.kext but no luck. adapter was shown in System info but not in network in system preference.
I reinstalled the kext and repaired permission. reboot with -f without success.
3. In have win7, OSX Lion in one HD, I installed ML in another HDD connected via esata docking. I could not boot ML fromChameleon bootloader installed with Lion in dual boot. I have to use USB to boot from installed ML HDD again. I could not use chameleon wizard because no internet connection. I installed Chamemeon 2.1 and copy extra fromUSB.
Hope someone can help me.
thanks