Where do You recycle an old computer?
You can drop it off at Goodwill, they participate in an electronic recycling program.
You have to take it to a recycling center
There are sites that specialize in recycling electronic equipment. Don't just dump it in the trash. There are hazardous compounds in there along with some precious metals that can be recycled. So much better for the environment.
First you strip it of all useable parts, then you take it to a recycling center.
In our city they have sites where you can drop them off. check on line under city services