I've been dealing with a very tenacious problem, which has introduced a number of others, for quite a long time.
I'm working with an HP Pavilion-e005tx (Specs) with an Intel HD Graphics 4600 and AMD Radeon HD 8670M graphics card.
Since updating to Windows 8.1, I've been having problems (supposedly) with the graphics card. Upon start-up, when I would normally see the login screen, I get a black screen. Others have had the same problem, but unlike many others, I do not see a cursor; just the startup sound and black screen.
If I disable the graphics card driver in safe mode, I can see the login screen and use my computer with very few issues. However, as the graphics card is disabled, I cannot fully use the system; for example, I cannot connect to an external monitor/projector. This is a problem.
I have attempted updating the drivers for the Radeon graphics card, including numerous versions. I recently had some success with an older driver, but Windows disables it and (in Device Manager) it says "Windows has stopped this device because it has reported problems. (Code 43)"; moreover, upon startup, I get an AMD error message saying there is no driver.
I really am desperate for help here. I've spent hours trying potential solutions to no avail. Any help would be VERY appreciated and I will supply any information necessary.