So I already put a CD in when my Mac froze and I restarted it. I tried to turn it on and I just get a blank screen while it makes a very loud noise. Turned it off then on, then a blinking folder with question mark. All advice says to run off the CD but I can't put a CD in since my CD won't eject. I also pressed shift, nothing. My hard drive crashed earlier this year and they replaced it, what do I do?? Ok, so I took my CD out by pressing down the trackpad button, installed disk cd, but nothing. Just a blank screen and a lot of noise.