So when I try to start up my PPC G5, I hear the start up tone, and then it goes straight to a grey screen with a flashing question mark. I followed all the steps on Apple's website to resolve this, I held option and started up, and all that came up were two buttons, one looked like a circle with an arrow at the end of it and the other was a straight arrow, also I couldn't move the mouse past a certain point on the screen, so the mouse was responding, it just couldn't move past maybe an inch on the left side of the screen. I tried restarting with the mouse and keyboard unplugged too, no dice. Then finally I decided to just re-install the leopard operating system. I put the disc in, go through all the steps, and when it asks me where i want to install Mac OS X, there's nothing to select. Where an icon for the hard drive should be it is just blank. I tried clicking the blank space to refresh it and nothing happened. Also, I read online that usually waiting fixes it, I left it on overnight and still nothing has popped up. Also, I've already tried resetting the PRAM, and nothing happened. If anybody can help me fix this it would be greatly appreciated. Either how to install Leopard again or how to start it up without the flashing question mark. Thanks!