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Hi Nolen, your HowTo was exactly the one I was looking for as I am new here. Thank you very much for this. I have followed successfully all steps to create the boot medium. Only at Step 6 I was not able to pick the zip file as only folders (Step 7) are allowed if I am right. My system, an unmodified Latitude E6420 with i5-2540M, 8GB RAM and Bios A21, boots legacy from my prepared USB Stick. But I get the following message after the boot screen disappears: EBIOS read error: Controller or device error Block 0x1d0798 Sector 0 EBIOS read error: Controller or device error Block 0x1d0798 Sector 0 EBIOS read error: Controller or device error Block 0x1d0798 Sector 0 EBIOS read error: Controller or device error Block 0x1d0798 Sector 0 I have tried to get more infomation with the -v flag. Much pages are shown. Finally the systems stops with (handcopied): ... SMC::smcInitHelper ERROR: MMIO regMap == NULL - fall back to old SMC Mode **** [IOBluetoothHostControlller ... completetd ... TRUE -- 0x2000 **** P-State Stepper Error 18 at Step 35 in context 2 on CPU 0 panic(cpu 2 caller 0xffffff7f8088d9a):pmLock: waited too long, help by 0@0xffffff80002e44ef Debugger called: <panic> Backtrace (CPU 2), Frame : Return Address 0xff... .... 0xff... Kernel Extensions in backtrace: com.apple.driver.AppleIntelCPUPowerManagement(1111.0)[EDE188A8-D142-3689-B2F0-26AB424A4CAF]@0xffffff7f8087b000->0xffffff7f808a3fff BSD process... Boot args... Mac OS version: 13B42 Kernel version: ... Darwin Kernel Version 13.0.0: ... Kernel UUID: ... System model name: MacBookPro8,1 ... System Uptime in nanoseconds: [longnumber] I am a complete newbie building OSX on a Hardware System, I only had few virtual OSX's (10.6 & 10.9) running until now. I have used 10.6 to build the USB Stick. All BIOS Settings are set to back default, only UEFI is active. CPU XD Support is switched on. Maybe someone has an Idea how to fix the issue as I like the idea to get OSX on my Laptop Thx Lars P.S. Sorry for my bad english