I am currently dealing with the same issue, except with a brand new RX 480 in Windows 10. Video is present with generic display driver until AMD driver is installed and my display shows NO SIGNAL and video never returns. Very frustrating--since I have tried both AMD website drivers and supplied drivers on disk.
My other cards, including a pair of HD 7970 and a single R9 290X work just fine so I am waiting on a response from the manufacturer.
I have the 7970 on w10 x64 and had the same troubles,what version windows do you have installed when you use the 7970?
I ended up returning the RX 480 for a different model and the new card works fine with no issues whatsoever. Bad luck I guess.
finally i find the fix for my laptop Amd HD 7650M 2GB + i5 intel
a.black screen issue when logon and b.installation black screen
1st try with hdmi / vga connected second monitor then try to install or try to turn on still issue persists
it a hardware failure gpu dead.try below step it worked for me.
1. need "air heat gun" and "heat thermal paste".
2. disassemble laptop fully.
3.remove heat sink with fan from motherboard clean the fan dust if your have and now able to find chip process and AMD Gpu in laptop.
4.read the chip which one is GPU and take "air heat gun" blow up-to 5 to 10 min then wait to cool 30 min don't touch chip.
5.put the thermal paste on both intel proccess + amd gpu chip place the heat sink carefully.and assemble your laptop
6. turn on install any catalyst driver .i have install 15.11 catalyst (don't install crimson driver it burn your GPU)
it working fine for me...
this very risk i have sony laptop the company is closed . i have no choice to service. i done by myself.
it help someone keep try any dead gpu and black screen issue