I can repair most any thing that dies on a computer.  

Install a larger hard drive and clone the info from the old one.  

Install new NIC (Network Interface Card).  

Add more RAM. 

Install CD-burner.

*** NOTE ***

Computer upgrades, especially to older non-current machines, can be very labor intensive.  For that reason, if the computer's processor is less than a Pentium II class processor, it is often better to buy a new CPU and re-use the disk drives and cards that can be re-used.  Any hardware saving is usually eaten up by the time it takes to re-configure an old machine with missing drivers.  While this makes me more money, I find it the most frustrating part of information systems management and I prefer not to do it.