Hi, Amanda.
You said that you "checked both device manager and computer manager", but
you did not actually mention Disk Management - and that is the proper tool
to use for creating one or more partitions on a hard drive - and for
formatting them and assigning "drive" letters. Maybe that's what you meant,
but we need to be sure.
What does Disk Management say about that HD? Maximize the window to get a
good look at all the info that is shown there. And check the Help file for
plenty of details about installing and managing hard drives. Note, too,
that Disk Management handles other kinds of devices, such as CD/DVD drives,
USB "flash" drives, and even camera card readers - just about anything that
can be assigned a "drive" letter.
If the jumpers and cables are correct, then DIsk Management should show the
HD, probably as "Disk 1" (since your original HD is Disk 0"). If you
right-click on the Disk icon in the Graphical View, the context menu should
have an option to create partitions on the HD. After you create one or more
partitions, the context menu will offer to Format them for you and assign a
"drive" letter to each primary partition and each logical drive in an
extended partition.
Note that My Computer cannot show an unformatted HD; at least one partition
must be created and assigned a letter before My Computer or Windows Explorer
can show it.
RC