it had been nice if there was a dealer.
Yes, i had the first time also problems with a QM.net card that was offline.
My cards were checked by the Dutch dealer. He helped me to find the problem and we came to the laptop and router as a problem. So, i had no issues by the power supply.
I you can't get your QM card online maybe it is the best option to send it to the Dutch dealer, he does maintenance on all cards and he knows the most of it.
He can check the powersupply and your QMcard and sends it back when it works fine. normally it taks 1 or 2 working days. I think you can have your card back within a week.