Had an old laptop that was slowing down and wanted to do a fresh OS install. Wiped the HD, but now I can't boot from a disk to install the OS. It always PXE boots even when I set CD to be the first boot option in the BIOS and LAN last. Pressing C to boot from CD does the same. I tried doing an install with this disk without dbanning prior, but ended up with two Windows 7s installed so just wanted to start fresh. I also noticed that it does not show that there is a disk in the optical drive in the BIOS. However, it was just working when I used a disk to wipe. How do I fix this?