Yes if this all started after you tried that card than the card might did something to the board or the CPU.
You really don't have a video controller like the older boards do. The video is in the CPU.
Can you have the CPU tested or try it in another board.
Here are the Beep Codes. Plus when was the last you clean in side your computer?
AWARD BIOS
1short beep :System normal
2 short beep :CMOS Error
1 long beep and 1 short beep:Memory error
1 long beep and 2 short beep:Graphic card error
1 long beep and 3 short beep :AGP error
1 long beep and 9 short beep : Memory Error
Continuous long beep :Memory not correctly installed
Continuous short beep :Power supply unit failed
AMI BIOS
1 short beep :Memory Error
2 short beep:Memory parity check error.
3 short beep :basic memory 64K address check error
4 short beep :Real Time Clock malfunction .
5 short beep :CPU error
6 short beep:Keyboard error
7 short beep :CPU interruption error
8 short beep:Graphic card error
9 short beep :Memory error
10 short beep :CMOS error
11 short beep :CPU cache memory malfunction
Plus you can check this thread out and try to get the backup to write over the main bios.
http://forum.giga-byte.co.uk/index.php/topic,12165.0.html