Lilygo t-call sim800L - Unable to start modem!

Hey everyone,
I tried to use a Lilygo t-call sim800L to send SMS to myself (for now), but I cant get the modem initialized. Can it be a power problem (It is plugged to my PC USB port), and if yes, how can I get the needed power while still plugged to the PC ?

Are you still working on this? I think I have the solution to get the modem on but I am struggling getting further along getting it working still.