Strange problems with nvidia video card

Hi, I don't know if it's really a problem, but I suppose...
I had in the last days serious problems with the nvidia card and ubuntu (see ubuntuforums or askubuntu).
Resuming I couldn't boot ubuntu if the nvidia card was enabled...
Now I only use windows because of this problem but I have another doubt: why the power manager sometimes don't show me the GPU usage (see image)?
In any case the nvidia (I think) is always working (the external monitor plugged in  the DisplayPort works... I think that's a confirmation)
Another question: at times when I watch video on youtube the nvidia is enabled at others not... is this a problem of optimus or not?
For me it's important that windows works (no problem if ubuntu doesn't works.. I posted the links of the problems with ubuntu just  for information on what's happened before this problem with windows..

I'm using Firefox with html 5...
But I also tried also with chrome, in which the html 5 mode in youtube is not activate, and I have the same problem...
I find it strange because if i have the monitor plugged in the nvidia GPU is activated (of course) and if i'm whatching a video on youtube when i disconnect the monitor the GPU won't switch to the intel but it still remains the nvidia activated until i close this video..

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    monitor- Proscan lcd hd tv

    Please explain what the actual steps included in "started over" and "everything has updated".  Was the Recovery DVD set or the Recovery partition used?  Doing "starting over" in that manner should get you up and running again.  Be cautious with updating from sites other than HP.
    There seems to be a precious balance with the I3, i5, and i7 processors and the software/hardware that is easily pushed out of balance by introducing outsiders, such as hardware changes or non-approved software updates.
    {---------- Please click the "Thumbs Up" to say thanks for helping.
    Please click "Accept As Solution" if my help has solved your problem. ----------}
    This is a user supported forum. I am a volunteer and I do not work for HP.

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