Monitor is not detected

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Hello
I recently bought a brand new PC
In store I checked, did computer is working properly; everything was all right
But when I tried to connect it at home, with my own monitor, there were flashing text "No Signal". As I've got 3 monitors, I checked all of them, and there were similar situation on each of them. Computer is booting up normally, keyboard and mouse is flashing, I can hear a start-up sound. I wounder if problem could be caused because in store computer was connected to a brand new, 150£ worth monitor, while I've got 2 "old-style" monitors and one quite old lcd.
 
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