I just installed a new HD (WD800) and it's not showing up in my computer or anything. It's set as slave and everything, and the computer recognizes the change when I boot it up. Help...

Howdy SubGum and welcome to PCHF,
What operating system are you using and also are the jumpers on the hd itself set to slave or master? Aslo if you have Xp try this

Right click my computer..Click manage...Click disk management...Now your HD should be in there. Try right clicking it and formatting it the way you want.

Whoops, forgot to add that I'm on WinXP, and it also doesn't show up in Disk Management.

did you take the jumpers off the hd itself? this way it is cable select auto.

You Said it notced the change upon boot up.. Is this on the BIOS boot up screen where it should read promary IDE etc. Also is it an SATA drive? Here are there tools for installin new drives
http://support.wdc.com/download/

EDIT: Keyboards sticking =)

It's and IDE drive. My computer doesn't support SATA. I'll try removing the jumpers completely and rebooting.

ok if that does not work try the instaltion cd or diskette's there is one you can use within windows as well

Ok, when I take the jumper out, it read the disk fine in the BIOS but tries to boot from it. I get the "No Operating System on Main Drive" thing. when it's set to slave, I get a message that change has been detected at bootup, but it only shows my C: drive and my 2 CD drives. Doesn't show the new drive at all.