WSOD and sometimes boots from external usb
I have a MBA mid 2011. Whenever I boot from internal or usb drive nothing happens except a white screen.
I've tried disconnecting the internal and booting from the external only but no luck.
Sometimes, let's 1\20 times, I am able to boot from the external only. During one of these times I reformatted the internal and restarted with the intention of doing a clean install. I got to the setup window for installing mac osx only to discover it would've taken 341 hrs to complete!!! So I restarted and am back to square one! Any info would be greatly appreciated please
thanx in advance