Projector source not found

[cmo23979]

I recently bought this projector the Optima PT 105 and have been using for the past couple weeks. Then all of a sudden it starts saying source not found, which doesn't make sense because i have been using the same hdmi cable since i got the projector. The projector is no longer recognized by my computer, but i have noticed that when i plug in the projector it is recognized in the screen resolution for a second then it disappears. Please help me solve this problem!

 

[noidea_77]

Try again with a short cable.

 

[cmo23979]

Try again with a short cable.

I tried that and it didnt work