No Display in Ubuntu 12.04

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http://askubuntu.com – I installed Ubuntu 12.04 yesterday. I installed it from a Live CD. All went well as per the installer. But after I restarted the system and logged in, my screen went blank except for the cursor. I restarted my system again but it is always the same. The login screen is displayed but once I enter the password and press the return key, the screen goes blank. Please help me with this......... My system configuration.... 1. HP Pavilion p6040in Home PC. 2. Intel Core 2 Duo E7400 3. 3 GB RAM DDR2 4. 500 GB Hard disk. 5. Running Windows 8 Customer Preview. 6. NVIDIA GeForce7100 Graphics. Please h (HowTos)