I appreciate every post that was helpful. I have the macbook sold in principal, obviously I want to get the hard drive wiped before i make the sale.
This is turning into a bit of debacle and I can assure you its unintended on my behalf, I have never had so much bother wiping a hard drive....
And problems continue, i hit the erase button, hard drive is wiped but restarting mac I can't get to the osx install...
Now I have nothing, no operating system to boot to, have pressed command r, no joy, pressed c, pressed option....im getting absolutely nothing.
At best if I wait, I can a grey screen on my external monitor with a mouse arrow which I can move about ok but nothing of any help....
Have bootable dvd of mountain lion, have pressed c while superdrive connected but no luck....im in process of making a usb bootable copy of mavericks....
But things don't appear bright....
Are there any other types of lcd screen thats are compatible with the macbook air display cable socket on the motherboard and I can possible hook up another display temporarily to get it sorted...