2010 iMac movie playing issues

[Slow Programmer]

I have a 2010 iMac, 27-inch, I7 2.93 processor, Snow Leopard. When I try to watch a DVD with either DVD player or VLC player the backgrounds are so dark I can't see anything. It happens on movies stored on the hard drive as well so it is not just a DVD issue. I have changed all the values I can find to adjust the picture, but nothing looks good. I can boot into Windows 7 on Boot Camp and the movies look great (very bright backgrounds and super clear). It has to be software or Windows on the same machine should look just as bad. Any ideas how I can fix this? The only reason I boot into Windows 7 now is to watch movies which is very annoying.

 

[simsaladimbamba]

Does it also happen in another, even temporarily created, user account?

Btw, it is either Mac OS X 10.6 Snow Leopard or Mac OS X 10.7 Lion, not Snow Lion.

 

[Slow Programmer]

Does it also happen in another, even temporarily created, user account?

Btw, it is either Mac OS X 10.6 Snow Leopard or Mac OS X 10.7 Lion, not Snow Lion.

I have not tried that, but will It has to be something simple. I also have a 2009 iMac that plays videos, DVDs, etc. perfectly.

I should not post half-asleep. You are absolutely correct it is Snow Leopard. I had Lion for a while, but reverted back to Snow Leopard for software compatibility issues. Unfortunately, I did not try to watch any movies when I had Lion installed so I don't know how they would have done.