Sadly, it sounds like you hit the [https://apple.fandom.com/wiki/Radeon_HD_6000M_series|RadeonGate] issue which was a defect is the AMD Radeon 6000 GPU’s] used in the 2011 series.
+
Sadly, it sounds like you hit the [link|https://apple.fandom.com/wiki/Radeon_HD_6000M_series|RadeonGate] issue which was a defect is the AMD Radeon 6000 GPU’s used in the 2011 series.
The only way to overcome this is to disable the discrete GPU and just use the Intel Iris graphics engine within the CPU.
At this point your system is in SMC lock when SMC encountered a catastrophic failure. To unlatch SMC o’ll need to disconnect the MagSafe and any other connections and then the battery. With nothing connected press and hold the power button to drain the remaining charge in the system about 15secs.
With the battery still disconnected the system should spontaneously start when you plug in the MagSafe charger. When it starts press the ***D*** key to enter into the onboard diagnostics. Depending on the macOS release firmware you may encounter that won’t work.
Sadly, it sounds like you hit the [https://apple.fandom.com/wiki/Radeon_HD_6000M_series|RadeonGate] issue which was a defect is the AMD Radeon 6000 GPU’s] used in the 2011 series.
The only way to overcome this is to disable the discrete GPU and just use the Intel Iris graphics engine within the CPU.
At this point your system is in SMC lock when SMC encountered a catastrophic failure. To unlatch SMC o’ll need to disconnect the MagSafe and any other connections and then the battery. With nothing connected press and hold the power button to drain the remaining charge in the system about 15secs.
With the battery still disconnected the system should spontaneously start when you plug in the MagSafe charger. When it starts press the ***D*** key to enter into the onboard diagnostics. Depending on the macOS release firmware you may encounter that won’t work.