8a420f71_BSOD_Index__Parameter_4
[Parameter 1] 0x2 [Parameter 2] The target device's device object, if it is available [Parameter 3] The device object [Cause] The device object completed the I/O request packet (IRP) for the system power state request, but it failed to call PoStartNextPowerIrp. [Parameter 4] 
The driver object, if it is available
BSOD Index
Parameter 4