So recently I went ahead and got an SSD hard drive - installed it in my Early 2009 iMac and everything worked fine. I then decided to give bootcamp a try and partition out the SSD following the directions of bootcamp. As I got to the installation of windows 7 professional i noticed the cd I had in there was an upgrade cd not the whole cd so the product key didn't work. I shut down the computer got the cd out by using the clicking of the mouse button trick and ordered the full version of windows 7 prof. Well needless to say this didn't work out. The computer wasn't booting properly after that so I decided to take out the hard drive and reformat it on my macbook pro by removing the partition and then erasing the whole hard drive. When I went to go boot up the hard drive and reinstall Yosemite the options to boot off the USB isn't working. I tried the Option key and Command R and nothing seems to be working. All the computer does is start off in the Grey Screen and then moves to the Black screen with a blinking ticker on the top left side of the screen. I need help getting my computer back to where it was and using OS X again. HELP