Hey , after a lot of googling i didn't found a solution to my problem. my laptop sucks @ " pci configuration end " when installing niresh yosemtie. i have tried the flags PCIRootUID, cpus, GE, USBBusFix ... etc, but the problem persist, any help please ? i have Lenovo b590 with I5 3230, 4Go, Intel HM77 chipset. thank you.