Hi,
thanks for the update.
Could you create a new non-sdk project using project wizard build it and debug?
If it does not work there could be a hw issue - please check if the board is powered correctly (LEDs 5V_OK and 3V3_OK are on). If they are off please switch J1 jumper to 2-3 position.

Do you have an external debug probe to test e.g. P&E Multilink?
Stan