Centos6 is hanged on startup.Showing only white bar

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http://www.linuxquestions.org – My centos machine was working properly on VM server ESX 5.0 Now i transfered it to VM server ESX 3.5. Then also it was working properly. But after some month when i gone to restart the machine it is showing only WHITE BAR WITH TEXT CENTOS 6.4. After this nothing is happen. But i m able to ping the machine through IP address since i set the static IP. How can i resolve this problem (HowTos)