You can get a pretty fast NEW laptop for $500, never mind repairing an old one for that much. MAC prices are funny.
The issue with the MAC drive is that it's probaly not formatted in a way that most media readers can read without converting the file system. To get around that you have a few steps to do. Note if the files are DRM protected that have to authenticate though iTunes, you can't do this.
Get an external drive enclosure, remove the drive from the laptop, install in the enclosure. Connect the drive to another MAC, copy out your files. Format the drive as FAT32. Copy the files back to the hard drive, hook up the drive to a network media player, another computer, a smart TV that can read hard-drive files, etc... and you're done.
If those things you want to play were bought from iTunes, you have to load them onto anther computer with iTunes and then burn them onto a disk or something and convert those to a non-DRM format like DIVX or xVID or a similar standard that is usable on many devices.