blank screen after login with mouse poiinter only.

[rahulvishwa81]

hi to everyone, I've centos 7 in VM ( in win 10) and i am instaling oracle 11gr2 server in centtos 7. after installing all supporting RPMs and finishing configuration i restarted vm. After that when i entereed password for user oracle screen goes to blank and and only mouse pointer is visible. how to recover it.