This problem is really twofold. I was trying to repair my iMac which had a black screen with the multilanguage error saying I had to power off the computer and power back on. I did this numerous time with no luck. Could not boot into safe mode either. So, I inserted the OS install disk and went to Utilities so I could check things out when the power in the neighborhood went out. Once the power came back on the computer will not read the CD, nor can I eject the CD and I get the same black screen and the same error. I have tried holding down the C key, the D key the Options key, the Command key and the Eject key with no luck. I tried holding down the mouse key as well. Any suggestions would really be appreciated. Thanks.