I have two Compaq Deskpro EN SFF machines. I can't open the case on either one. I feel stupid because I opened one of them a couple of months ago and installed a graphics card. Now I want to move the card to the other machine and I can't get them open! I understand there's a software lock of some sort? How do I disable this? One machine is a PIII 1GHz running Win2K, the other is a PII 633 (or similar) MHz running XPhome. Thanks for any help.