can be 3 problems
most likely your GPU uses an modified bios and your driver isnt "patched" with atikmdag-patcher.exe
Thanks for the reply!
Sorry, but im not very technically savvy.
Is this something related with new drivers? Because the graphics card worked fine for a year...and I updated the drivers, at least once in that period without causing problems...
ah i thought you bought the GPU used
mh - are you sure you or others didnt changed your GPU?
what driver you have installed? 17.10.3?
download latest DDU on a usb stick (you need different pc for that)
start windows in "safe mode"
run DDU as admin
download latest driver 17.10.3
install latest driver
1. modified Bios and driver not "patched" with "atikmdag-patcher.exe"
- to fix use old gpu and your R9 380 together - flash correct bios (from VGA Bios Collection | TechPowerUp - HAS TO BE CORRECT) with "ATI-Flash v2.74"
- or you can start windows in "safe mode" and patch driver there with "atikmdag-patcher.exe" (AMD/ATI Pixel Clock Patcher)
2. maybe old driver left on system that crushes GPU - use DDU in "Safe-Mode"
3. maybe faulty GPU (would be more likely as) or not enough power on pci-e 6/8-pin (still you should reach desktop then)