5 Card Sapphire Fury 4GB Stopped Working, Help!!!

[rockallnight]

Hi,
I have invest in sapphire fury 4gb HBM 9 month before (amazon online purchase)- No Waranty & last month one card stopped working , now i have another 4 stopped working.
I am using them cause the hash rate is good (460 Equihash & 30 Ethash) stable. i am using claymore , cards getting hot yes but my AC can do the cooling, I wonder why only sapphire have this issue cause i have another patch but asus,
specs are below for each rig:
win 10 creator
amd 13.6.2 driver
standard claymore bat file configuration
MSi after burner (need to set the fan to 80% so the temp not exceeding 70 degree)
I wonder can those 5 cards repaired or they are dead now.
they are not detected in any motherboard (changed more than one)
also changed the psu but still no chance.
only the dual uefi button light (that mean the card have power) but i don't know why not spinning & detected.
please if any one technically know how to fix or guide it will be appreciated.

[1715300936]

1715300936

[1715300936]

1715300936

[[YAZ]]

I didn't sure what's the problem with your cards. But in my experience with R9 390, I'm using heat-gun to bring back die card to back to work, after heating the processor, I replaced the original bios with the other one from Techpowerup bios stock and worked until now.