I am posting from my brother's computer now. The 4850 is in here now and when i connected it, it showed no CMOS checksum error.
mobo was my old one ASUS A8N SLI Deluxe. This officially rules a bad card out for causing a CMOS checksum error and strenghtening my specific mobo compatibility claim.
However, this means I can give the 4850 to another brother who uses an HDTV for a PC monitor. He took the DVI to HDMI adapter an hour ago and said he can switch his 8800 GT with me. The HDTV PC brother has a Q6600 on an ASUS P5n SLI mobo