Currently Being ModeratedDec 18, 2013 1:02 PM (in response to Joann272)
if you have a FireWire cable and access to a second Mac, you can boot your MacBook Pro in Target Disk mode. That will allow the second Mac to access your Mac as if it were an external drive, through which room can be made on your MacBook Pro’s startup disk.MacBook Pro, OS X Mavericks (10.9)
Currently Being ModeratedDec 18, 2013 1:03 PM (in response to Joann272)
Do you have a bootable backup from which you can boot the computer? Do you have another Mac with a Firewire port?
What version of OS X is installed? Do you have your Snow Leopard installer DVD that came with the computer? If so, then you can purchase an external drive. Connect it to the computer and boot the computer from the Snow Leopard DVD. Partition and format the external drive, then install OS X onto it. When completed you can boot from the external drive so you can start clearing space from the internal drive. You will need to pare at least 20 GBs from the internal drive.
Currently Being ModeratedDec 18, 2013 3:43 PM (in response to Joann272)
If you learn how to use Terminal / a command shell, then you can delete files. You can run Terminal by booting your recovery partition, and get straight to a terminal by booting into single user mode.
Currently Being ModeratedDec 18, 2013 4:05 PM (in response to Joann272)
Sometimes you can try booting up using Safe Mode. Turn the computer on and hold the Shift key. This may stop enough processes from running that may allow you to log in; albeit slowly.