Fans and power lights don't turn off in standby

Fans and power lights don't turn off in standby

My desktop computer (Zotac 8200 motherboard) has a problem when I put it into standby mode. I use Windows 7 to put it into standby. The cpu fan, system fan, and PSU fan don't turn off. Nor does the power light in the front of the computer. I can't find any settings in the BIOS that all me to control this strange behavior. The computer can resume successfully from standby so it isn't froozen. What can I do? Thanks