Parallels Desktop 9 for Mac lets you seamlessly run Windows and Mac applications side-by-sid

OS X 10.9.3 virtual machines won't boot in Parallels

Reports from forums around the web describe an incompatibility with Parallels Desktop 9 and the new OS X 10.9.3 update, where Mavericks running in a virtual machine won't boot after being updated. The reports describe the virtual machine freezing at a black screen. A workaround was reported in Parallels forum that limits video display to 1024x768 but allows booting.

The problem seems to be an incompatibility with OS X 10.9.3 and the Parallels Tools video driver. The reported workaround is to boot the virtual machine in OS X "single user" mode and delete the Parallels tools video Kernel extension using a text command. Here's the workaround:

1. Configure the Guest to 'Select Boot Device on Startup'

(Guest -> Configure -> Hardware -> Boot Order -> 'Select boot device on Startup' is checked.)

2. Boot the Mac guest OS into 'Single User' mode.

(Start the Guest, hit 'return' when prompted to enter startup options, then indicate '-s' as a boot option.)

3. Mount the root partition 'read/write' by issuing the command

(Enter 'mount -o update /' on the command prompt once the guest has booted.)

4. Delete Parallels tools video Kernel extension.

( rm -rf /System/Library/Extensions/prl_video.kext)

5. Reboot the machine.

(Enter 'reboot' on the command line.)

If you've seen this problem or tried this workaround .