|You've given us very little to go on. No motherboard make/model, nothing about the hard drives (SATA or IDE), etc.|
"Iv set jumpers on both HDD"
That leads me to believe they are IDE drives. If your board has 2 IDE channels, the HDD with the OS should be the primary master & the 2nd HDD should be on the 2ndary channel as either master or slave. Make sure to use 80-wire IDE cables & do NOT use the cable select jumper setting.