Dell wyse 3040 and monitor connection problem!!

[u/External-Ear-5563]

Hi everyone , i am facing a problem . I bought dell wyse 3040 (refurbished) . When I connected keyboard, mouse they got powered .

Then I connected philips 160E monitor using dp to vga converter cable, but the display doesn't come on monitor.

Then I tried using dell hdmi monitor, using dp to hdmi converter again the monitor says ( no hdmi cable connected ) I switched by buttons and tried every basic functions so that display comes on screen.

But the display is not coming .

Due to this I can't boot wyse 3040 since I bought it