Replacement Laptop hard drives usually cost between $50 - $150 depending on the speed and performance of the drive. If you have to purchase a new version of Windows 8 OS goes for about $80 - $100. Then you have several hours of "Rebuild" work to install the OS and Drivers. Even if your time is "Free" and you know how to do it, you are spending almost as much as simply buying a new one.

Let me put it this way. I have done hard drive swaps several times in various PC's and Laptops. Every single time it involved a crap ton of time to get it all done and by the end I wish that I just shit canned the old computer and replaced it with a new one because the few dollars I saved by rebuilding it were completely wasted in the time it took to get it done. If PC's and Laptops were still $1000 - $1500 then its worth the pain in the ass to rebuild them. But now you can get them all over the place for $250 - $500 so its not worth the effort to try and "Fix" them. Buy a new one and take the old one to the range and shoot it up for some entertainment.