Fix specific broken parts
If your keyboard or trackpad is royally messed up, consider some workarounds or replacement options. Trackpads are notoriously difficult to replace, but an easy alternate fix is to simply switch to an external wireless mouse. Replacing a keyboard is slightly less daunting -- scope out your options here and look up your specific model's user manual online for installation instructions.
Add some RAM
If you want to beef up your machine's ability to multitask, consider installing some RAM, which acts a little like the Tin Man's oilcan to make your machine more nimble when running several programs simultaneously. Use this site to find the right kind of RAM for your particular model, and get cozy with Lifehacker's handy installation guide.
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Joe McGauley is a senior writer for Thrillist and has been using his 2006 iBook as a doorstop for the last few years.