How do I get back into setup on a laptop after I told it to ignore the hard drive during it's boot sequence?

It wasn't booting. Locked on preparing to run scandisk. I went into setup. Supposed to be able to change the order of boot devices. Wouldn't work. So I removed the hard drive and something else from the boot sequence and told it to boot from a cd I have. Now it won't boot at all. Black screen. How do I get back into setup from here?How do I get back into setup on a laptop after I told it to ignore the hard drive during it's boot sequence?
Tap F10 to get into the bios when booting up or F12 to get into the boot menu. Or, if you have the install disc, do a repair install.How do I get back into setup on a laptop after I told it to ignore the hard drive during it's boot sequence?
You will need a Windows XP or Vista CD, you have to reinstall the OS.
you have to get into the bios, usually it's by hitting furiously the delete key right at the beginning, or look on the net for what key your brand of laptop requires. I hate the ones that make it different from the almost universal delete key. good luck