Yosemite Stuck at Black Apple Screen - HELP Please

Tried to install Yosemite on my Macbook Retina Pro stuck at Black Apple Screen Progress bar is about a third done. Beach Ball is spinning been more than five hours. Tried a reboot, zapping Pram etc. still no go. Should I reinstall old system and if so should I use my Time Machine back up or do a fresh install of Mavericks?
**** everything was working so nicely before I tried the Yosemite update.

Hi,
Do you mean that you're unable to logon to Windows no matter via normal start or safe mode, and startup repair doesn't work with the disk?
For this error "gets stuck at 'Loaded: \Windows\system32\DRIVERS\avgidsha.sys' every time", hope this link can help you
http://forums.avg.com/ww-en/avg-forums?sec=thread&act=show&id=94159
I also suggest you try other advanced boot options such as Using Last Known Good Configuration, see this link
http://windows.microsoft.com/en-in/windows/using-last-known-good-configuration#1TC=windows-7
NOTE
This
response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you.
Microsoft
does not control these sites and has not tested any software or information found on these sites.
Yolanda Zhu
TechNet Community Support

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jenan123 wrote:
I have the same problem. We need hellp here.
I can't help the other person, it's a old post and it sounds like they had a hardware issue anyway, which we can't fix here.
If you can start a new discussion in the MacBook forum and describe your problem in detail, perhaps we can assist.
The system works via email responses/notification and rewards points, but only for the original poster.
jenan123 wrote:
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Thank you for using Apple Support Communities.
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Yosemite Stuck at Black Apple Screen - HELP Please

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