SDR error 005

[Blastin]

I attempted to connect a Behringer ADA8000 to my SDR, I powered on the Behringer and then the SDR, I was getting signal from the Behringer(master) from input 1. I set the clock source to Adat, and no signal was received by SDR, external drive, record mode. So I tried Word Clock as clock source, and no signal was received by SDR. So I attempted to start a new project and when I was asked which drive internal or external, I chose internal and that's when the error 005 (B005) appeared. Is installing a new harddrive and operating system, the answer? Also, what is the correct procedure to open the SDR case? Just remove the screws?