In parallels desktop 9, I installed MAC OSX 10.9 Mavericks and I installed parallels tools too. After that I can't boot osx in parallels... It happen by graphic kext. So, We have to remove that kext for solve this problem!
Step 01. Go to Guest OS' configure screen. And goto Hardware -> Boot Order. And check "Select boot device on Startup.
Step 02. Reboot your guest os. Then you can see the screen like below.
Step 03. When you see "Press any key to enter starup options." this message. Just type any key except enter.
Step 04. Then you can insert some options. Type "-s". It's for safe mode. After that press Enter(Return) key.
Step 05. Now you are in safe mode and see console interface. Type "mount -o update /". It's for to change filesystem can be modifed.
Step 06. And type "rm -rf /System/Library/Extensions/prl_video.kext". It's for remove video kext file.
Step 07. And type "reboot". Then you can get that screen below.
This problem will be solved next version maybe :) Enjoy your parallels!
