I am experiencing the same problem but ErP Support is disabled. I replaced a defective HP mobo with this GA-880GM-UD2H. It always boots from the HD and tries to go into HP recovery no matter what but can't do it because it is a new motherboard. With a new (empty) HD, it will boot a Ubuntu CDROM or a Windows 7 Home Premium OEM DVD but NOT with the original HP HD installed. I want to recover as much of my files as possible without resorting to a new install of Windows on new drive (if I can even get past the licensing). Also I would like to be able to chose to boot from the SATA DVD/CDROM.
Update: I switched the SATA cables between the HD and DVD drive and it wouldn't boot HD or CDROM at all. So I moved the HD back to SATA2_1 and moved the DVD drive from SATA2_0 to SATA2_4 (the last one) and NOW it booted onto the Windows 7 DVD. It still doesn't appear that I will be able to save my files on that HD but I did make copies so I can copy them back later. I didn't see any recommendations for where to physically connect the drives on this mobo. Am I blind?