1. No mention of the OS.

2. What hardware issue could this be?
My answer is it sounds like a software issue.

3. "I have an new computer..."
You have a WARRANTY issue. A new machine shouldn't develop such an issue when new.

I suggest you contact the maker and make it their problem. If you want to solve it, be sure to post in a Software or OS Forum that matches. Note the OS, the DVD player software and versions of everything.

I can play DVD on my 256 Meg RAM PC with either Windows 98 or XP, so I think it's not a RAM or hardware issue.

Bob