burn two max 10 in 2 hours, someone please tell me the power on/off secquence

burn two max 10 in 2 hours, someone please tell me the power on/off secquence of the altera fpga and jtag

i use 5 years xilinx and recently i want to use altera

i think may be my bad habits make me burn two max10 in 2 hours

1. the usb blaster is connected with the computer, but is not connected with the PCB

2. the pcb is power off

3. i connect the usb blaster with the pcb(maybe that why i burn the fpga)

4. i power on the pcb

then i can not download the sof file to the fpga....

someone please tell me:

1.what is the sequence of power on?

2.what is the sequence of power off?

3.when the usb blaster is connected both with the PCB and computer, can i power off the PCB and then POWER on it?