Oracle VM Server  Goes To Black Screen After Logging in 

After installing oracle linux6, i was able to play for some time and then i tried installing guest additions which is failing pathetically when i rebooted it starting giving a blank page.

I tried below things,

1. Increasing RAM

2. Increasing Video Memory

3. Disabling 3D Acceleration , NA/PEX

Trust me nothing worked out for me ...Wasted 24 hours on this nasty bug

Solution:

Switch  VMSVGA to VboxSVGA (which is no longer supported!) corrects the problem.