Device Manager is not detecting AMD VGA-
I've tried using AMD's Auto Detect Utility. But it shows me this message-
This is the correct LAPTOP AMD Driver for your R9 m375 GPU Card: AMD Radeon™ R9 M375 Drivers & Support | AMD .
This is the procedure for installing your AMD GPU driver in a Laptop: Laptop graphics update...How to
But before using the AMD generic laptop drivers, try downloading Lenovo's Display driver first and installing that and see if your GPU is recognized. If it is, then try updating to AMD Driver as per the link above.
Make sure you have the latest BIOS and Intel CHIPSET for your laptop: laptops and netbooks :: lenovo z series laptops :: z51 70 Lenovo PC Support - US
If Lenovo's own Laptop drivers don't see your GPU Card. Then it is possible your GPU card may be bad or your computer is not working correctly.
Go here to Lenovo's Support and use their Diagnostic page to Scan and do a Deep scan of your laptop for problems. Maybe it might fix the problem why your GPU card is not being seen.
GO here to scan your laptop from Lenovo Diagnostics: laptops and netbooks :: lenovo z series laptops :: z51 70 Lenovo PC Support - US https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-z-series-laptops/z51-70/diag...
Also run SFC /scannow in elevated Command Prompt to check your Windows installation for errors.