I experienced the same prob with Yosemite where my screen went black on startup. I was able to "fix" it and log into my qccount but my mac is running super slow now even just at simple clicks and commands. How can I fix this? Help please!

I updated to Yosemite and everything worked great for a few days until earlier. My mac was plugged to my TV via HDMI wen everything hanged. I did a hard reset and the screen was just black during startup. There were the startup sounds but no images from the screen. it did have images at one point where it gave me options to reset my password. I did a couple of hard reboots and pressed Alt/Option or Cmd+Option+P+R based on previous posts. Didnt know which w but I was able to access my account and log in. My big problem right now is that my Mac became super slow. Even at the simple commands/clicks

My mac was okay up until a few hours ago. If anyone knows how to fix this, would really appreciate your help. Thank you!

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