Ok, so today I just upgraded my stock Macbook hard drive to a Seagate Momentus XT Hybrid 500GB 7200 RPM drive, and I upgraded the stock RAM to 8GB of DDR3 1333. After the upgrade, everything worked smoothly. And freaking screamed out frames on Wolfenstein and Devil May Cry 4 in Boot Camp! Barely dropped under 50 FPS on high settings. It was a beautiful thing 
When I quit Wolfenstein, and rebooted using the Windows menu, OSX was starting up normally.
Then a grey progress bar loaded up and took about five minutes to fill. I should also mention that the Wolenstein disc was still in the drive when this happened, in case that's in any way relevant. I wondered what was wrong, so I restarted from the Apple Menu and got it again. And then a third time. So now I'm making a full backup onto my external drive. In case it's a failing hard drive like most of the stuff I found from googling said it was if the progress bar showed up numerous times. And I'm writing this question in the hope that someone highly competent answers. I really know my stuff, I have a computer engineering degree and A+ hardware certification, this is just a problem I haven't ever encountered before. Also, I accidentally posted this question on my non-Answers account earlier, I switched it over to this one, in case anyone is wondering on the double posting.
When I quit Wolfenstein, and rebooted using the Windows menu, OSX was starting up normally. Then a grey progress bar loaded up and took about five minutes to fill. I should also mention that the Wolenstein disc was still in the drive when this happened, in case that's in any way relevant. I wondered what was wrong, so I restarted from the Apple Menu and got it again. And then a third time. So now I'm making a full backup onto my external drive. In case it's a failing hard drive like most of the stuff I found from googling said it was if the progress bar showed up numerous times. And I'm writing this question in the hope that someone highly competent answers. I really know my stuff, I have a computer engineering degree and A+ hardware certification, this is just a problem I haven't ever encountered before. Also, I accidentally posted this question on my non-Answers account earlier, I switched it over to this one, in case anyone is wondering on the double posting.