Hi. I have a problem with my macmini (2012, maverick, bootcamp -win8). I cannot boot any more. I hear just the chimes sound and get only a grey screen. I tried resetting pram but i couldn'd. Nothing happens, when i press "alt-win-p-r". I also tried all keyboard-combinations (SHIFT,ALT-R etc..) on a apple usb keyboard. No luck with this too. I just see a grey screen. I did everything what apple is suggesting: http://support.apple.com/kb/HT1379?viewlocale=de_DE. No Luck too. The last thing i did was on Maverick "Preferences => Boot from bootcamp". I readed in many forums, that the first chimes-sound means, that all hardware is OK? Is this right? What can i do now? It is not possible to reinstall, because i get just a grey screen. Does somebody has this problem too?