I am pretty sure I have just maxed out the space for start up. I can't get past the message box that pops up and says you need to shut down your computer in 4 languages. I so hope this isn't the logic board. I tried restarting and holding down command option p r and command option n o and unplugging the power cord from the back and plugging it in as I press the start up button. then release the start up button and press again. Nothing helps. I cant get past to free up the space or use disk utility Do I start it from the start up disk holding down the c key and do a reinstall?