Could be:
1. Wrong Vbios
a) with Gsyc
b) without Gsync
c) with optimus
d) without optimus
2. Booting not into UEFI mode.
3. Error code 43 in most cases means a faulty card.
4. 980m made by DELL, incompatible with some clevo, msi laptops. (from what I remember, different pins layout for temperature sensor). Check subvendor/vendor of gpu, by seller maybe?
When 980m is in slot/socker and notebook is working, does gpu heatsink getting warmer? There is small heatpipe(from GPU heatsink) which is going to CPU heatsink(ends with a small plate) you have to unscrew it first - separate gpu and cpu heatsinks.
Can you see anything in bios gpu slot?
Does device manager show 2 positions under display adapters?
If you want to "play" with it there is a gtx 1070 in best possible edition to get, only one downside, it requires graphics drivers modification to make it work.