I need help after I installed a new western digital 640gb hard drive into my thirteen inch unibody MacBook. I formatted the drive and everything and then proceeded to back up my old hard drive from my time capsule and after 4 hours everything was working fine and then it said to redraft my computer. After I did this the computer has been stuck on the same grey screen wi an apple logo and spinning cog or wheel. After I let it sit like this overnight it still did not stop this.ni have tried a safe reboot and that didn't work. And I cannot insert the snow leopard cd because it is already in there from the install and i cannot eject it. I still have my old hard drive in case this doesn't work and everything is all backed up. Please help!