What error are you getting? Verbose mode and screen shot it
I have the same problem (yosemite boot stuck on halfway loading bar) whether I upgrade and do clean install
I installed with bootflag -x
ran Multicast with options given in the guides (upgrade and clean install)
rebooted and got stuck on halfway loading bar
note: I can only boot Yosemite with bootflag -x
My build
Asus p8z77-v
i7-3770
Asus Radeon HD7870
16GB RAM kingston
120GB Intel ssd 530series
**********************Solved**********************
For some reason my change to Chameleon the first time with bootflag "dart=0" was not working so the second time, I moved it right below the <key>Kernel Flags</key> then repair perms and rebuild cache with DPCIManager(as shown on
http://www.tonymacx86.com/mavericks...nstall-10-9-asus-p8z77-v-pro-succecssful.html) . Now hard drive boots by itself and it is really fast.
My solution, move around dart=0 second time then repair perms and rebuild cache again :
<key>Kernel Flags</key>
<string>dart=0</string>
I tried many other solutions posted online for the loading halfway bar problem, eg:
-add
AppleACPIPlatform Rollback -> 10.9.5,
-disconnect HP printer
-Under Preferences -> Energy Saver, uncheck "put hard disks to sleep when possible."
-Check bios settings and disable virtualization