Hi, been a while since I've been here! I took in a April 2011 macbook pro with the dreaded white screen issue. I backup up his data after doing the usual things, Reset PRAM/NVRAM, tried to boot to recovery, no go, not there. Finally just booted to tech tools from usb and wiped and repartitioned the hard drive to do clean install of el Capitan, boots to apple, halfway along line stops, reboots to white screen. Fine. I roll back to clock and try the orig osx, snow leopard, boots to apple symbol and hangs. I already ran hd and other system tests. . Ideas??