This started happening after I had booted GoS (Linux) live CD. Computer starts up, I get the Apple logo in the middle as usual, then moments later I get a circle with a line through it. I tried booting with the "option" key and selected the install DVD but I still get the circle with line through it. The computer was working just fine until I booted the live linux CD. Tech support says it is a hardware issue and that I should bring it in an apple store. Here is a pic of what the circle looks like: http://img266.imageshack.us/img266/3148/img005ct6.jpg It's the circle with line through it but without the apple logo.