Youtube is not working anymore in Safari

Hi.
Since yesterday, Youtube videos are not played on my MacBook Pro. It's a new MacBook pro with Yosemite.
I don't have Flash and don't want to install it because the laptop burns when I watch videos with Flash and the battery is dead too soon.
I only use HTML5, but the videos don't work anymore.
I restarted the computer but nothing changed, I only get a black screen. Not even the adds work.
Any idea?
Thanks

Flash Player 15.0.0.223 is the latest version of Adobe Flash Player.
1. System Preferences > Flash Player > Advanced > Delete All
     Press the "Delete All" button.
     Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
   Download it first.
   The next step is important.
   Click Safari in the menubar and select “Quit Safari”.
    Follow the prompts and install it.
    Restart computer. Relaunch Safari.
2. Allow Plug-ins
    Safari > Preferences > Security
    Internet Plug-ins > "Allow plug-ins"
    Enable it.

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I use Adobe XI reader.
I have in one PDF several hyperlinks to mp3 files in the same directory as the PDF and one hyperlink to a Youtube URL.
They all used to work.
The mp3 hyperlinks called the Windows Media Player.
The YouTube URL calls the browser.
But now, the mp3 hyperlinks do not work anymore.
The Youtube URL still works.
The mp3 hyperlinks appear to be correct.
I have downloaded Adobe Reader XI again but that makes no difference.
Please Help!
Jan van Puffelen

*     I downloaded both files and moved them to My Documents.
*     I tried to start the mp3 from the pdf
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In my case the hyperlink in the PDF points to:
file:///C|Documents and Settings/Jan/Mijn Documenten/Spaans, Maçonnieke
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If Safe Mode is switched on, it does not work at all without any error
message
If Safe Mode is switched off, it works, however, it does not call the
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In the CD1.doc version the hyperlink works correctly, it calls the Windows
Media Player
Can I send you my test doc, pdf en mp3?

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From the site I linked to previously:
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eidnolb
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http://kb2.adobe.com/cps/865/cpsid_86551.html#prob1=fnctn,

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