With the current release of EthMiner you may need to update your start config from the old format to the new one.
It should now look something like this for AMD:
setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
ethminer.exe -P stratum1+tcp://0x73f4bb52abd8233aaafe92c55e3654a94980a8b4.PCNAME@us1.ethermine.org:4444 -G -R
In some cases you may receive the error
No OpenCL platforms found
Error: No usable mining devices found
which is caused by a missing DLL file in the latest AMD drivers which is needed for OpenCL.
Go to
C:\AMD\Radeon-Software-Adrenalin-2020-20.12.1-Win10-64Bit-Dec8\Packages\Drivers\Display\WT6A_INF\B#### Folder
then copy the amdocl64.dll file to your C:\Windows\System32\ folder.
Next open regedit and create the following key path: HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenCL\Vendors then create REG_DWORD amdocl64.dll
or like this for nvidia:
setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
ethminer.exe -P stratum1+tcp://0x73f4bb52abd8233aaafe92c55e3654a94980a8b4.PCNAME@us1.ethermine.org:4444 -U -R
You should be all set now.
If for some reason you are still having an issue add pause to the last line in order to see the error and prevent you cmd window from closing.