Rx 480 not booting

Mastpiece

Prominent
Apr 15, 2017
3
0
510
Hello, i recieved my rx 480 today,
And as soon as i start my pc all the fans work and the led lights go on, but it doesn't reach the bios.

Resetting the cmos lets me go to the bios once, and after that it won't go there again until i reset it again.

What i've tried:

Put the card in my brothers pc, and it did boot.
Used my brothers power supply, didnt fix it.
Resetted cmos like i told
Reassembled my old videocard again, and that does work
Updated bios
Removed all drivers 3 times with ddu

My specs:

Motherboard: asus m5a97 LE R2.0
Amd fx 8350
Amd rx 840
500w power supply

I have tried so many things, im totally out of ideas
Does anybody know what the problem might be?
 

Mastpiece

Prominent
Apr 15, 2017
3
0
510
How can it be the PSU if my brothers psu doesnt work too in my pc, but when i plug my card in my brother's pc with his psu ( which i have also tried plugging in mine ) it does work