SIMtrace stopped booting

Hi, I got the hardware kit of the SIMtrace. It booted successfully (I guess because I got the red light on the board). Then I connected the jumper to the test pin (I read the user manual so I act according to it). When it booted up, I got green and red lights. After I tried to power it on again without the jumper, I got nothing (no light) and no recognition with lsusb command. I tried to connect the board to other PC, and still no lights. How can I fix it? Thanks in advance! Bests, Gal