Rumba32 board V1.00 not showing up in device manager

[tonytam2]

I currently have 2 rumba32 boards that can't seem to connect to the PC through the USB. The USB led lights up but not the 3v or 5v. There's no activity in LED1 either. Also the board doesn't show up under the device manager either, no ST bootloader and no Rumba32_F44VE CDC in FS mode. Zadig USB driver re-installer is not picking up the board and soldering 100k resistor to PB2 to GND in EXP2 header didn't do anything.

Any advice is greatly appreciated.