Q: Can login but only white snow appears on screen. I get a message that my start-up disc is full, empty files', but I can't open it

Your drive is no longer usable. You can remove it and replace it with a new drive. You can install it in an external enclosure so you can access it from another computer. You can completely erase the drive and start from scratch. You can connect your computer to another Mac if both have Firewire ports. Connect them via a Firewire cable. Boot your computer into Target Disk Mode. Boot the other computer normally. You will find your drive on the other computer's Desktop. If you can access your drive then you can start removing unneeded files from your Home folder. You need to free up around 5 GBs or more in order to boot from the drive assuming the directory isn't completely corrupted.

Freeing Up Space on The Hard Drive

  1. See Lion/Mountain Lion/Mavericks' Storage Display.

  2. You can remove data from your Home folder except for the /Home/Library/ folder.

  3. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.

  4. Also see Freeing space on your Mac OS X startup disk.

  5. See Where did my Disk Space go?.

  6. See The Storage Display.

You must Empty the Trash in order to recover the space they occupied on the hard drive.

You should consider replacing the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.

Try using OmniDiskSweeper 1.8 or GrandPerspective to search your drive for large files and where they are located.