You could try fixing it as a learning experience ,parts are easy enough to get at weekend markets or on ebay .Useful if you want to try building a new PC.
You will almost certainly spend more trying to fix it than buying a similar machine in working condition. I fixed up an old P1 133mhz Win 95 machine as a project and learnt alot from it. I would now feel much more confident in assembling my new dream system when I can afford it.