I have the new Ethernet version from Ubid as well, and have had similiar problems.
1st. Heed the advice of aadam12: especially the part about setting the partition as ACTIVE, using fdisk. I wish I had that advice a week ago as I was pulling my hair out... In order to do this, I had to physically switch drives in my PC (using a rather inexpensive laptop HD adapter) to make the laptop HD Drive 1. That is the only way fdisk would let me set the partition to ACTIVE.
2nd. You have probably not damaged your DOC. If you removed the ethernet card and then booted, and then replaced the ethernet card, you always get the 'boot from network' option. You can configure the BIOS startup routine to look at your HD 1st.
Anyway, I'm learning lots as I go along, and will be happy to share all the details...