Video Acceleration not working

Hi,
I have a new MacMini Mid2011 server, core i7 with Intel HD Graphics 3000 384 Mb. It seems that video acceleration is not working: trying to watch a youtube video in Chrome only shows a hole (ie, I can see the window behind), and on Safari I only see a black rectangle. If I disable the Hardware Acceleration in the flash settings, I can see the video, so I firsth thought this was an issue just with flash. However, this is not the case: I can see tears when scrolling a regular page in the browser (chrome and safari), videos with QT or VLC also show tears. Also I have configured the Desktop pictures to change every 15 minutes, and every time there's a transition, it's not smooth anymore, I see a lot of artifacts (ie, flickers, white areas).
Anyone seen this issue? I think it started happening after the last update, but can't tell for sure.
I tried the following stuff:
1) Ran Apple Hardware Test (didn't find any issues).
2) Cleard NVRAM and PRAM.
3) Erased the HD and installd Lion Server from scratch.
I'd really appreciate any pointers here...

Just a note, EFI won't show up once installed because it
is firmware in the Mini itself.  Java is also independent of
OSX so it will not show up.
With that aside, if you did a reinstall of Lion after the
Thunderbolt 1.1 update came out, it will already be
in the OSX download.
Something to check, if your monitor has a DVI input,
try using the adapter that came with the Mini and connect
to the monitor that way.
Another thing to try is a PRAM reset.  Make sure the
monitor is on then follow this procedure:
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html
As far as test software, TechTool Pro has video testing capabilities
as well as other features.  That is the first that comes to mind.
Probably not a bad idea to get it anyway.

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