Question Why does my PC freeze when GPU is connected ?

Disvsros

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Jul 24, 2013
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I switched gpu from r9 390 to 1070 yesterday and the computer isn't working with any of these gpus right now.
Once I start the pc it freeze after about 20 seconds, I tried to reset the bios but it still isn't working.
When the gpu isn't plugged it's working without any problem, what can cause the issue?
 

Disvsros

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Jul 24, 2013
57
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18,630
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OS: windows 10
CPU:i7 4790k
Motherboard: gigabyte z97-d3h
RAM:4x4 g.skill 1333mhz (dual channel) (2x4gb)
GPU: old gpu r9 390/new gpu nvidia 1070
HDD: evo860 500gb
psu:antec 750w eag pro

I tried to flash the bios already and tried to use another psu (600w) but it isnst help
update:now its crashing even without the gpu mounted
 

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