QU drive light allways on

hello :
mi QU24 with 1.9 FW , worked ok , the 1st time I tried to do a USB recording using the QU Drive
I had to format the USB drive , and it took forever , actually it never stopped .

after that , the QU-drive yellow light is allways on , with or without a drive connected to it .

additional problems , My mac can no see the QU24 anymore .

please help .

Power cycled?
Hard reset?