Cannot install any linux distribution

Greetings all,

My problem stands in the name of the topic, if specifically, before Ubuntu was placed, but now do not put any version, after the appearance of the Welcome screen and selecting the first item "Start or Install ..", computer hangs up, and nothing happens, this is happening with Debian and Suse, etc.
There are suspicions in the iron, but just can not figure out where to look?

DO NOT INSTALL after:

replaced video card from 7300 to 9600 (nvidia),
added another SATA hard on the 500 gb.

I ask for help if someone had, Prompt where to look?

Have a look look on these threads -

http://forums.techarena.in/guides-tutorials/1014376.htm

http://forums.techarena.in/operating...ms/1026400.htm

check the ram, it sounds like it is corrupt.... you can use memory test. select it from the boot menu where you usually start the installation in opensuse.