So awhile back i built a kaveri computer with the a10 7850k, and recently i decided to upgrade and get a discreet graphics card, and r9 270x. It worked for a couple days, then one day, the computer screen wouldnt even boot and my keyboard and mouse wouldnt light up to indicate it had power. The computer would work just fine if i unplugged my graphics card and removed it from the pci slot, but it doesnt work when i try to use it. I went to my friends house to test the graphics card and psu that i recently got, and they both worked just fine. So i suspected it to be a motherboard problem. I replaced the motherboard, and still the same problem. Now when i unplug the 270x and try to use integrated gfx, it doesnt work and the mouse and kb doesnt even light up either. When I switched back to my old motherboard, i couldnt even use the integrated graphics card. The mouse and keyboard didnt light up either, and I tried multiple times. PLEASE HELP ME FIND A SOLUTION :c
Specs
a10-7850k
8gb crucial ballistix sport xt ram
gigabyte f2a55m-s1 mobo -old
msi a78m-e45
msi oc edition r9 270x
wd caviar blue 500gb