Disposing of your old PC's
Old computers can no longer be thrown in the garbage, nor flushed down the toilet. Their materials are toxic, and in fact may be illegal to dump in the usual manner.
Some recommended ways to dispose of old computers are:
1) donate them to co-workers, family, or friends.
2) sell them to other companies or individuals. Newspapers or on-line services (such as E-bay) may be useful.
3) donate them to charitable organizations. This may also result in tax deductions.Alameda County Computer Resource Center
Before donating a PC, it is probably wise to remove all data completely from the hard drive. There is a free program called Killdisk that can do this without the possibility of having the data "un-deleted".