Yosemite update crashes all systems. Black blank screen.

Updating to Yosemite is a nightmare. Now, all I get is a black, blank screen. Apple updates are destructive.

Hi @Ersatz ,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP Pavilion
Notebook and getting a blank or black screen on startup. .
Here is a document on overheating that might help both issues of black screen and overheating.
Here is a document on computer will not start.
Please note remove any and all USB devices. Disconnect all non-essential devices before starting troubleshooting.
With the inverter it is the easiest part to replace and the least expensive.
I would need the serial number to give you matching part numbers for your system.
Please review the HP Privacy Statement . Then send it to me in a private message.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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