Still having problems with gpus

[Lemtea]

Hi I posted here not too long ago about a 1050ti not giving a display output on my system. When installed in my system I do not get any signal on my monitor but the monitor detects that the cable is plugged in. I have tried updating the bios, using a different pcie slot and power supply and uninstalling graphics drivers but nothing has worked. The system boots up without a problem with the old GPU (gts 250) in it and the gpu itself is not dead because I took it back to the shop on it worked fine on their test system. I then purchased a xfx r9 280x in the hope that it might work in my system but so far I have the same issues. Does anyone know what the issue is and are there any beta bioses for my motherboard that I can try.

 

System specs:

• CPU
  Intel Core i5 760
• Motherboard
  Gigabyte P55A-UD3
• RAM
  Hyper X Fury (2x4gb) 8gb 1866mhz DDR3
• GPU
  gtx 1050ti
• Case
  Cooler Master CM 690 III
• Storage
  Wd Blue 1tb
• PSU
  Siverstone Strider Plus 500w
• Display(s)
  Benq G2000W 1680x1050
• Cooling
  Cooler Master Hyper 212 Evo