do you have a different GPU at your hand?
you can try to flash the correct bios to the R9 390 again - its maybe a fix (big maybe)
but to be sure - your PSU can handle GPU? and everything connected?
I have had my set up for almost a year now the gpu just stopped working properly. the gpu i am using right now is the cheap one from ebay and it works i am just wondering if the issue with my old gpu is fixable or if it is completly gone As i said worked fine for over a year and just now started black screening and ramping up the fans.
system specs without the gpu.
Ryzen 7 1700
MSI B350M gaming pro
16 gigs trident z 3000
1000w Rosewill Quark PSU
clean the GPU
new thermal paste if you dare to remove cooler (and put it back on)
PSU is ok
how did you buy the GPU? used? if yes - flash current bios
if you had bad luck it was used for mining - and is dead now
Already cleaned and reapplied thermal paste. Arctic MX-4 bought new from newegg 2 years ago (finally found the invoice.) No mining. Flashed the bios last year and kept the original bios on the secondary bios option. its not the bios. tested both same issue.
does it smell? like killed electro?
sell it as defective at ebay and buy a new RX580 4G
or wait what the RX580X brings
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Did you carefully checked the pcb, i mean naked without vrm heatsink, to check if there are any broken smd component, especially near the vrm power stage.
Check also if the vrm metal shroud, fan assembly, heatskink are well mounted, avoiding any shorts.
From how you describe the issue it seems that, if the t° are not the issue somewhere, applying a mechanical stress on the card by disassembling it, brought it back alive for a few mins.
It could be there are some small solder crack somewhere under the balls of the die or the ram and/or somewhere else on the pcb. That why disassembling could made it works for some time.
The other explanation could be a power supply issue, but i suppose your replacement gpu is quite small and do not draw the same current as the 390. So you could maybe not notice the issue straight.
Usually if you want bring back dead gpu, when there is nothing else to do, you bake it in a oven at a precise t° or use a heat gun to heat the pcb.
The idea is to melt the solder to repair the small cracks, that break electrical connections. This could work in some cases where the gpu have no physical or component damage.
Other than that, it could simply be that the die/ram itself get some high voltage and just died, but pcb is intact.