I just purchased a Toshiba Satellite A75-S206. I knew it had issues when I 
bought it. However, I am trying to determine what the issue might be. I can 
boot up into windows no problem. But, at the login screen, there circles in 
the upper left hand corner. I suspect it is an inverter. But I don't have 
any proof of it. I can hook up an external monitor and have it work with out 
a problem. The screen looks fine in the BIOS. There are no cracks or 
blemishes in the screen itself.

Thanks,
Alexander