My Start Up Disk is Full and I can get no acces to anything when the computer starts

The computer turns on and I can get no acces to anything. It display a message "Your Start Up Disk is Full" and comes to a white screen. I can only move the mouse but there is nowhere to click.
How can I delete any files, so the computer can come back to life?? Is there any way I can acces those files??
I'm using 250GB and this Mac has 500GB total memory.

Supposedly one can hold the Shift key down while booting (Safe Mode) and that's supposed to allow one to boot the machine when the startup disk is full.
Step by Step to fix your Mac
If that works, then use a storage drive (not TimeMachine) to move excessive files too likely starting with Movies (large and easy) or iTunes supscirptions downloads which have gotten out of control.
Most commonly used backup methods
Another method is to create a boot drive on a external drive, this then will allow one to option key boot the computer and remove files off of the internal drive, allowing the free space needed for OS X to swap stuff to the drive and operate.
Create a data recovery, undelete boot drive
Now for some reason it takes rebooting the original drive to get OS X to recognize there is free space available again, so reboot the machine normally (no Shift key). Just saying that because you may be wondering how come it does't register when you delete stuff later.

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