I have a huge problem after installing rEFIt. After i used the installer and restarted my Mac 10.9.5 wont start again. I know there is the option within safeMode (holding down shift key), but i cant get in to safeMode start up somehow. Even when I inserted a USB drive with the Mac installation on it, in order to change the start up option, i could not get in to OSX. I unscrewed my Mac to get to the hard drive myself, deleted the folders and again nothing. Still Mac does not start. (Folder EFI in root and some rEFIt blesser folder ) Then in SingelMode the bless command wont work cause of read only setting. Same is for diskutil and others. I also did this COMMMAND ALT P an R in order to reset the NVRAM. But nothing. I am in pure despair. Is there really Nothing to do?