I have a 13" mid 2010 MBP w/ a samsung 470 in the opti bay for a boot drive. I was just working online and i started to get the beach ball out of nowhere, which is very uncommon for me. i then started to shut everything down cause i had a bunch open, then i did a SW update and went to restart. I should mention while the update was loading I attempted to throw some things in the trash from my desktop n got a error 50 code or something like that. Now it powers up but wont allow me to login to my user. stuck at the login screen. pls help!