|Start the computer....ignore any messages. Put the cd in and reboot.|
If it does not boot from the cd and you cannot get into the bios F8 F2 ? because they are password protected remove the small battery (size of a quarter). Leave out for a few minutes then replace. Bios password should be gone.
If not there is a small jumper next to the battery. (flash light and magnifying glass) or good eyes. Remove ...wait... replace.
You might also try pressing and holding down the f2 thru f12 keys to see if a boot menu comes up and then select the cd.
Hope this is of some help