I have a storage server with super micro motherboard -X7DWN+. I updated the bios to R 1.2c. The bios update went well. The system rebooted itself after update and i made the changes in the new bios as i wanted. After rebooting once again, no video. The machine turns on but no video.

SOURCE: I need to know what kind of video card to use in

You'll need a PCI video card. Amazon has many of them at http://www.amazon.com/s/ref=nb_sb_ss_c_1_5?field-keywords=pci+video+card&url=search-alias%3Delectronics&sprefix=pci+v
I do this for fun and feedback not $$$
Jim