You can salvage just about all of it. I don't know that you would ever use any of it though - probably not. You'll end up like me a few years ago - a whole wall stacked full of old computer hardware from floor to ceiling in a tiny apartment. This stuff starts to accumulate and becomes more trouble than it's worth.
I would pull the HDD and the RAM and sell the rest on Craigslist for $15 OBO. If that won't work, try $10 next week. If that won't sell, try $5. If still no one calls, just post it in the Free section.
You can use the RAM in any machine it's compatible with, of course. It should be 400MHz PC 2100 SO DIMM.
As for the HDD - when my HP lappy croaked, I bought a USB-SATA cable with a case - now I have a portable 100GB HDD.
Your drive should be 2.5" IDE - something like this would work:
New Aluminum External USB 2.0 to IDE 2.5" Hard Disk Drive HDD Case Enclosure 500GB Max Capacity - $6.99 from Amazon
You could salvage the screen and the DVD drive too - but when's the next time you'll actually
need it? I always saved hardware for "someday - just in case" - but someday never came, and I ended up with a mountain of crap (still have a smaller version of the mountain).
My advice, save the RAM and HDD, get what you can for the rest before it becomes useless clutter.
:good: