Question My display is going black!HELP REQUIRED

Aug 21, 2019
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I have a sff desktop Hp 800G1
Spec: i5 4570 ,8gb of ram , 1tb hard
I have connected an external gpu XFX RX480 8GB using an external power supply and pcie extention cable
Now the problem is when i start gaming all things work fine but suddenly after some time 20-30min later display turn black saying no signal going to power saving mode this same happens every time
I dont know whats the problem and which part is causing it
 
Aug 21, 2019
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i used an 420 watt INBOX ATX power supply and used an pcie extension cable 16x to 16x
I didn't used any dock except for the adaptor hdmi to vga to get display
 

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