Hey everyone, so I kept getting wanings that my memory was low...I turned it off so that I could restart it never came back on. I ran the hardware diagnostic and it said the lower ram slot wasn't working so I went out and picked up a new stick of memory and threw it in the upper slot. I ran the diagnostic again and it says it fine. However, once I get to the "mac os x is starting" screen the bar will continue to spin indefinitely and it never makes it to the actual login in screen where I can type my password in. Also, the computer won't start up in safe mode (it locks up at the grey apple screen) and my superdrive doesn't work all the time, and after I ran the last diagnostic the computer doesn't recognize that I have a disk in the drive even though it spins up. Any help or ideas would be awesome, the apple store's service department where I am is closed today and I have a large paper due tomorrow that is partially on the computer. Thanks, and sorry if there were any spelling or grammar mistakes I typing from my iPhone.