Apple MacBook 13"White /2.0Ghz Intel Core2 Duo White/2GB (2x1gb)/80GB/SuperDrive (Z0DT) Mac Notebook "saffire" Questions

...13"White MacBook 2,4 GHz Intel Core 2 Duo, 2 Gb 667 MHz DDR2 SDRAM, OSX 10.5.6 with Focusrite Saffire LE. No sound, could connect several times, and I hope all equipment is OK. Please, help! ...