Conflict with the display and the PC display will...

Question

the pc was installed with an os together with the monitor when 15 computers were transported to other place the monitors were interchange. The display now of the PC's will not come out. The video card are not functioning well. sometimes it turns sometimes not. Does the monitor inter change affected the display of the monitors? Thank you please help me on this....my product motherboard is ASROCK and video card are vvidia editions