Samples can´t be loaded into RAM of WK 6

On my WK 6 I used to have some nice 3rd-party-samples until my internal hard disc got broken. I replaced the damaged disc by a small SSD. Then I tried to load the sound samples on my floppy-discs into the RAM, in order to store them on the SSD afterwards. At the first glance the procedure of loading the samples appeared to be quite normal, and finally the names of the sounds could be read on the display; instead, none of those sounds could be heard. Has anybody got an idea what could have gone wrong? Thanks for your answers.

When was the last time you loaded samples? Are the chips gold? or Tin? try cleaning the contacts for a start.