I have an older 20" iMac, mid 06 I believe. I was getting a blinking folder and apple icon everytime I tried to boot it. Keyboard shortcuts didnt work, nor could I boot from the CD, nothing seemed to work. I ended up taking out the HD and putting it into a dock, and running the imacs CD from my MBP, and try to partition and re-install the software onto the original HD. When I got to the part of booting from the imacs cd on my MBP, I got the same flashing apple and folder icon on my MBP. Is it because I am running the imac software cd on the MBP, or is it something else? Anyone have any suggestions?