by naums » Mon Jan 22, 2018 10:37 pm
Hello,
First off: please post everything you know and or see when asking for support, like "blue LED stays on". This will help identifying the problem.
Now: do you have an MicroSD card installed at the same time. Did you set the Bootdevice-selection switch to the right position? Are the LEDs on, blinking? Do you have a correct power supply and did you set the jumper correctly for selecting the power supply (microUSB or power-plug)?
Regards,
naums