My mac pro will not play HD video anymore?

Just in the last 4 - 6 days or so my Mac Pro (os 10.7.4) will no longer play HD video. On you tube, detroit tigers web site, espn videos nothing? plays for 5 - 7 seconds and starts replaying the last 1 second clip over and over and over again. the sounds continues on the track but not the vidoe? Anyone else experiencing this?
Please help
I've tried reintalling Flash no difference.
I was going to download Firefox but funny enough the tutorial that is played on the video screen comes up flashing and green.

buckmacie,
has the video been completely downloaded onto your MacBook Pro when you start to play it? Or are you playing it while it downloads, AKA streaming it?

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my macbook pro will not play a video without pausing every 11 seconds. PLEASE help me figure out what is wrong. very frustrating. I have already tried restarting

buckmacie,
has the video been completely downloaded onto your MacBook Pro when you start to play it? Or are you playing it while it downloads, AKA streaming it?

My MacBook Pro will not play YouTube videos ever since I downloaded and upgraded to OS X Mavericks. Any suggestions?

I know that this is not an issue with my internet not working, because I have this problem regardless of which wireless network I am connected to. Thank you!

Try unistalling and reinstalling
http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html
http://get.adobe.com/flashplayer/otherversions/
Also see this:
Re: I am unable to watch youtube videos online
created by Linc Davis in MacBook Pro - View the full discussion
If you're sure you've installed the latest version of Flash, take each of the following steps that you haven't already tried. After each step, relaunch Safari and test. For a "missing plug-in" error, start with Step 5.
1. If you're only having trouble with YouTube videos, sign in to your YouTube account and load this page. You may see a link with the text "Leave the HTML5 Trial." If so, click that link.
2. If you're getting a "blocked plug-in" error, then from the menu bar select
 ▹ System Preferences… ▹ Flash Player ▹ Advanced
and click Check Now. Quit and relaunch your browser.
3. Triple-click anywhere in the line below on this page to select it:
/Library/Internet Plug-Ins
Right-click or control-click the highlighted text and select
Services ▹ Open
from the contextual menu.* A folder should open. Delete the following item, or anything with a similar name, if present:
• Flash Player (failing).plugin
You may be prompted for your login password.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combinationcommand-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
4. Re-download and reinstall Flash. Download it from this page:
Adobe - Install Adobe Flash Player
Never download a Flash update from anywhere else.
5. If you get a "missing plug-in" error, select
Safari ▹ Preferences... ▹ Security
from the Safari menu bar and check the box marked Enable plug-ins.
6. Select
Safari ▹ Preferences... ▹ Extensions
from the Safari menu bar. If any extensions are installed, disable them.
7. In the Safari preference window, select
Privacy ▹ Remove All Website Data
Close the window. Then select
 ▹ System Preferences… ▹ Flash Player ▹ Advanced
and click Delete All. Close the preference pane.
Hope thi helps
Credit Linc Davis

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Try re-installing Quicktime.

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Try the following user tip with that one:
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www.apple.com/support/bootcamp
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My mac pro will not play HD video anymore?

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