Problem when trying to upgrading Ubuntu 12.4 to 12.10

Problem when trying to upgrading Ubuntu 12.4 to 12.10

This is totally freaking me out. PLEASE HELP ME!!!!
Ok this is what happened, I have an existing Ubuntu 12.4 running on my
laptop, I visited Ubuntu's website out of nowhere and I saw this new
Ubuntu 13.4 and I was so interested because of Ubuntu's flowery words
"Best version yet" or something like that. It just wont update directly to
13.4, I needed to upgrade to 12.10 first. OK. On Ubuntu's website, it says
"Click here to follow SIMPLE upgrade instructions. I did. It showes me a
very simple instruction that I followed. I waited for 5 hours because my
Internet connection was just so bad and still tried to finish upgrading my
Ubuntu. After 5 hrs, it got finished and prompted me to restart. THIS IS
WHERE EVERYTHING GOT MESSED UP!!! It closed all the programs, the toolbar
and all that EXCEPT for the WALLPAPER. It hanged on there. I waited.. and
waited.. and waited... for 30 mins and nothing is happening. I was forced
to to just force shut it down. I booted again.
First screen says: Ubuntu Ubuntu with advanced menu(something like that)
then long violet scree.
Then Ubuntu logo showed.
Then GONE. THEN THERE YOU GO, PLAIN BLACK SCREEN WANTS TO BE WITH ME
FORVER!!!
I was just following Ubuntu's "SIMPLE GUIDELINES" on upgrading then
everything got messed up. I NEED HELP! HELP! HELP!