When using the Nvidia 64-bit binary driver (1.0-7167,7174,7676), starting X might lock up the system or produce a blank screen. This only occurs under 2.6.11 kernel or higher.
The symptom has occurred on the Marquis K825, C610, C620 and C625. Systems that are configured with 4GB memory or higher might experience the symptom.
http://www.nvnews.net/vbulletin/showthread.php?t=49340
Use the open source driver (nv) or use the ASL customized Nvidia binary driver provided on the ASL Driver CD version 3.88 or higher. The executable file is NVIDIA-Linux-x86_64-1.0-7676-pkg2-ASL2.run stored under ASL-packages. This customized binary driver includes two patches described here:
http://www.nvnews.net/vbulletin/showthread.php?t=58498
Note: The open source driver (nv) have some limitations including: