GPU 1070 not detected

Feb 18, 2018
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I got two gpu which is a palit sjs 1070 which i switch from two of my computers..

One is being detected and another one is not detected or not showing in my device manager all of a sudden.

When i insert both of them the other gpu is not getting detected as well... these are the test i did.

Insert 1 gpu not detected = not working
Insert 1 gpu detected = working
Insert both gpu = both not detected

Tried this to my two units and same results. Does my other gpu is now dead? Or did i do something wrong?

I want to warranty the unit but they say it might takes months.

Please help