Video card does not work in server

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http://serverfault.com – I want to install a video card into a server. When it is inserted, server does not boot up and there is no video signal coming from video card. 4 LEDs at the back of the motherboard show pattern G-R-R-A which means "Disabling the console controller" (see Appendix C in manual). There was another (older) video card in that PCI slot and it worked fine. The card which I want to install works too (I tested it in another computer). Both On-board Video and Dual Monitor Video options are turned off in BIOS (when I turn on one or both options, both new and old video cards dont work). What should I try (HowTos)