cd rw install problems

Help please!
I've just changed the original CD rw on my Dell of 2 years ago with a Benq
but the computer doesn't know it's there. Not listed in My Comp. but drawer
of device opens/closes (ie: has power) My OS is XP. This is an internal
device with IDE pin connection. Reading the newsgroups indicates others with
same or similar problems. Are there general instructions on how best to
replace/add devices without getting into trouble? I've read about setting
"jumpers" and indicating "slave" and "master" status of devices which is
Greek to me...where are such things accessed?
Expert help would be much appreciated.
mvdunn